8.1 Liter 2500 HD pickups???

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bowhuntinfool's picture
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8.1 Liter 2500 HD pickups???

I am looking into buying a different truck, because the 01 Chevy with the 5.3 is not going to handle my horse trailer this summer. I am curious if anyone out there has a 3/4 ton chevy with the 8.1 liter and the Allison tranny. What kind of mileage are you getting empty and pulling. Any info would be appreciated.

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We have a 2004 3/4 ton with the 8.1 litre in it with the Allison tranny. Excellent motor and a bulletproof tranny! We get about 8mpg with it when we are not pulling and about 5mpg when we are pulling it. Plenty of power if you are willing to feed it!

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Wow thats not near what I was told that they would get. I was talking to a dealer the other day and he told me that the 8.1 liters are getting better mileage than the 6 liter 3/4 ton pickups. Thanks for the info. Do you think that this is about average or do you think he was telling a tall tale.

Snow,
If I understand correctly, you are a chevy dealer right? What have you heard from customers?

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Get a Ford F350 diesel, 16.5 mpg hwy, 12 pullin HEAVY trailer. Have they got the allison tranny bug fixed on the chevies?? just curious

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I had a 2001 2500HD Crew with the 8.1 and Allison and just got a 2005. With my 2001, I typically drove 75-85mph (what can I say...I speed a bit). My mileage was a pretty consistent 12mpg. The 2001 had a 4:10 rear end. Towing my boat (2025 Lund Pro V) last year out to Lake Michigan I got between 9 & 10 at 70-75mph. The best I ever got was 14 (nice day, now wind, towing nothing). The worst 5. The 5 was pulling a 32foot high profile 5th wheel and my boat into a 35-50 mph wind. Even pulling those things into the wind I was easily able to do 70-75. The power is AWESOME. Coming back without the wind I got 8. I have no idea what it got in city driving because most of my driving is highway. I'm sure it wouldn't be very good though. I only have about 3000 miles on my new 2005 and it appears I'm getting between 10 and 12 on the highway so far. My 2005 has a 3.73 rear end. Good Luck. If you don't like the smell and mess of a diesel, you'll love the 8.1. I'd probably go with the Duramax, but I ice fish out of my truck and they're still too noisy and choke out anyone down wind of you.

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btw....I never ever had a tranny problem. The Allison's a pretty cool tranny. When you press that tow/haul button, the truck becomes a totally different truck. It's nice to have a tranny and engine that actually work together.

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Originally I was planning on buying a Duramax, but with Diesel prices and the initial cost of the Diesel trucks is figuring to be a bit high for my price range. For a used truck with less than 50,000 miles there seems to be about a 7-$10,000 difference. Plus Diesel is about 20 cents a gallon higher in price than gasoline. I still haven't made up my mind and that is why I am asking these questions. I figured that I would ask people that use there rigs for multiple uses...Hunting, Fishing, & work.

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I worked for a guy with the 8.1. Pulling a skidder or driving with just the box loaded with tools it seemed to always be around 8-10. I think the only way i would buy one is if i planned to tow large stuff all the time. My dad has the 6.0 and it shifts a lot during pulling but when you unhook you do get better milage. He has pulled a 5th wheel all the way to alaska, and this winter to texas and back and the truck hasnt had any troubles.

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bowhuntin,
Yup,I'm a dealer and "yup" someone is triing to off their 8.1.There has been pushrod issue's on some around 30k,the tranny is Bullet proof unless there has been a tire upgrade(larger size)from factory spec's,LT245.The larger tire will change the shifting pattern,thus cause excessive wear.Now there are other option's and ways around the larger tires.Any question's shoot me a e-mail "www.northstaroutdoors.com"

Sold a paving company a bunch of HD's a few years back w/8100,now they are in the same truck but running the duramax... Worth the money if you drive alot or pull/payload is heaving.

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bowhuntin,
This is Snow...

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I would also recommend the duramax diesel. I got back last night from a trip to Missouri with an '03 one ton dually. We were pulling a 32' stock trailer and made around 8 miles to the gallon. The power is unbelievable. We drove between 75 and 80 most of the way(we had places to be) and the pickup handled it with no problems.

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I know that I would prefer a duramax, but I am a little worried to say the least to buy a used one, due to all the misuse of chips and reprogramming. Maybe I shouldn't be but..... I know if I buy a duramax, that I will be putting one in, but at least I will know I haven't abused the motor or tranny.

Snow,
I couldn't get an e-mail to send yesterday.
Drop me a line at wranglers_@hotmail.com
I will reply back to you. Thanks...

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Snow,
Offline question for you, have there been alot of problems with the door hinges on the new chevy's? My 05 Durmax 3/4 HD already has sprung one door and the other is about to go. No major wind or nothing.

 

Good Luck and Good Fishin'

Eric T

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walynut,
Not that I know of? I'll check into it and let you know if anything pop's up.

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Thanks, Tim

Little annoyed, 5000 miles and $700.00 damages for no real reason. Never new that three little marks in the door from hitting the hinges cost so much. Maybe I need to get into the bodywork buss. LOL

 

Good Luck and Good Fishin'

Eric T

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A diesel would be far better for pulling than a gas. A friend of mine just went to Oklahoma and averaged 25 mpg with a 2004 Dodge Cummins that was with the box full with a tool box and 2 Combine rotors. He said that we also get about 30 mpg when he drives it decent. He has the Edge performace chip in it to get this kind of mileage though.

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Can a guy really get 25+ mpg with a Diesel and a chip?...boy if so, I made a big mistake trading my SUV for a car to save some money on gas....

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mallard man,

Has your buddy had any problems with the tranny? Is it an Auto or Manual? There are some really good rebates right now on Dodges, but I have always been a little leary of their trannies.

One of my buddies chipped up a 1999 ford 7.3 and his first trip after chipping it, he went to Arizona and averaged 23mpg for the whole trip. Evidently conditions were perfect, because after he got back he has been only averaging about 18-19mpg, which is still good. Do all cummins get that good of mileage? I have heard the newer ones get worse mileage than the old...

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He has a 6 speed manual in it. He hasnt had any trouble with the tranny in it and he beats the heck out of everything. He has a 2004 i believe. My dad just bought a 2005 and the dealer told him that the 2004 get better fuel milage though. The Edge programmer he has also gives it 75 more horsepower but can be adjusted to more but if it is moved up anymore he would need to change to a 4" exhaust system.

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You're in luck.  I have a black 2003 suburban with an 8.1 liter engine that I have decided to sell.  I had a race trailer I pulled about 10,000 milies and the 8.1 liter engine never blinked.  You can't even tell you're pulling a trailer - even up hills.  This has been the best truck I have ever owned.  I sold my trailer 3 years ago and I have been trying to rationalize why I am keeping it.  But now I am driving  my kids all over the place and it's time.  I have 103 K miles on it and it runs like the day I bought it.  I live in Indiana.  Give me a call if you want to talk.  My cell is 317 496-8567.  Jim

Purcy22

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mallard man Said:
A diesel would be far better for pulling than a gas. A friend of mine just went to Oklahoma and averaged 25 mpg with a 2004 Dodge Cummins that was with the box full with a tool box and 2 Combine rotors. He said that we also get about 30 mpg when he drives it decent. He has the Edge performace chip in it to get this kind of mileage though.

Thats the bigges bunch of hogwash I've read in a while, there's no way in hell that he can get 25mpg emty moreless 30mpg as he claimed. Although I'm an avid outdoorsman my number one passion is trucks and there is NO, NOTTA, NOTHING MADE IN A 3/4 or 1 Ton truck that even get close to those claims! NEVER HAS, NEVER WILL! the most fuel effiecent diesels made were the mid production 7.3L Powerstrokes (96'-98'), a good number of the Cummins for about 94"-02", and some of the early Duramax's could see a tad over 20 give or take with optimal conditions and keeping your foot out of it, that means 60mph. Crank em up to 75mph and they lose about 3mpg! For reference, a 97' PSD F250 extd cab long box with stock tires (265s), 3.55 gearing, a topper, with a custum burned SCT 5 position chip and full exhaust went from a 17mpg truck to a 20mpg truck so long as you drive at 65mph or less. this is a constant and achievable mileage, not a "I was able to hit 25mpg one time will driveing 55mph, with a tail wind, and heading down hill" type of claim.

Enough of that, that 8.1L is a good solid engine and got similar mileage to the early versions of the 6.0 Vortech V-8 and the Ford V10s. Depending on the configuration of the truck you should see 13-14 on long highway runs 10-12 in town and 6-8 towing anything substantial. They have a lot of gunt down low and breath realitively well when you wind them up a bit in the RPM range. I personally have owned a V10 for the last 5 years and run with a buddy that has the 8.1. comparitively speaking the 8.1 is on average about 1mpg thirstier than my V10 under the same conditions. it does how ever seem to have a little more grunt down low in the RPMS but looses that advantage once there wound up a bit. this is primarly due to that extra 1.3L of displacement. his only complaint is for what ever reason, since the day it came off the lot, it's always wanted a quart of oil every 3k miles. I don't think they are all this way but it runs like champ and has been very good. You can't go wrong with one as long as you can come to terms with the fuel mielage.

I've never personally driven his with a load but have followed him to the lake and although he's pulling about 4-5k lbs less than I am (I'm grossing about 22k), I've yet to see any hills he hasn't been able to run 65mph back up to the top, this includes trips between Minot and Bismarck and the two hills west of garrison heading towards douglas bay and indian hills.

I will add that we've both noticed that our trucks use LOTS of fuel ideling. We can drive to the lake 50-70 miles pulling the train and use a 1/4 tank of fuel, but the 4 trips to the boat landing and back, hooking and unhooking the trailers, and a trip over to get bait, a total of about 10 miles, uses another 1/4 tank of fuel.

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A chipped diesel will get a 40% improvement. 
If you have any money bring it on. Stepson with 02 dodge 5 speed driving 70 mph comming back from Denver got 24.4 . He used my credit card because I needed him back here. If you drive them like you stole them nothing gets good mileage.

If a diesel gets 17 without chip it will get 22-24 chipped.

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i have a 04 duramax i pull a high profile camper and get 10. with a boat behind that maybe 9 the transmission is indestructable, the motor in a 04 and older has had some injector issues. but that is a warranty covered issue. as far as the price difference between the gas and duramax, your mileage increase will more than pay for itself in 2 years if you drive 12k miles a year. That being said, in my opinion duramax p/u are really not made to be grocery getters. if you want to make short trips around town use a car. I hear more people having trouble by driving short trips than any other thing. but i would never buy a 8100 over a duramax just to save a few bucks those are 150k motors at best

if you are to old to cut the mustard at least  lick the jar

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the best mileage i got was21 on a trip to sd with a good tailwind and driving 70 but if you drive 75 you lose at least 1 mpg and who exactly gets 30 with a dodge? is it maybe justin theel?

if you are to old to cut the mustard at least  lick the jar

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I have a 2006 2500HD Crew 8.1 6 speed allison 3.73 rear with about 37k on it and am always between 12 and 14. I have to agree with yarcraftstorm does seem to be thirsty when you put around but I have never been below 10 mpg. So far I love the truck, can't stand having a diesel in the winter time so this was my best option. Truck before was 2500HD 6.0 4.10 rear and made 14 so no big difference there. Most people I talk to the 6.0 never does much better than 16 and has alot less power.

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This may seem like a stupid question, but if the performance is so much better with the chipped diesel engines, what's the drawback that keeps the manufacturers from using the chip settings as factory original?

There has to be something or Ford, GM, and Dodge (going out on a limb with the last one) engineers have far more data and understanding of those vehicles than anyone at an aftermarket chip manufacturer.

“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain

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that no bull about getting 25+mpg with a cummins i own a 2002 dodge extended cab long box 4x4 with a cummins with over 200k on it with an edge juice with attitude in it and even on a windy day i can get 25 miles to the gallon at 70mph on the highway highest ive got was 31 at 65mph on a calm day

YarcraftStorm Said:

mallard man Said:
A diesel would be far better for pulling than a gas. A friend of mine just went to Oklahoma and averaged 25 mpg with a 2004 Dodge Cummins that was with the box full with a tool box and 2 Combine rotors. He said that we also get about 30 mpg when he drives it decent. He has the Edge performace chip in it to get this kind of mileage though.

Thats the bigges bunch of hogwash I've read in a while, there's no way in hell that he can get 25mpg emty moreless 30mpg as he claimed. Although I'm an avid outdoorsman my number one passion is trucks and there is NO, NOTTA, NOTHING MADE IN A 3/4 or 1 Ton truck that even get close to those claims! NEVER HAS, NEVER WILL! the most fuel effiecent diesels made were the mid production 7.3L Powerstrokes (96'-98'), a good number of the Cummins for about 94"-02", and some of the early Duramax's could see a tad over 20 give or take with optimal conditions and keeping your foot out of it, that means 60mph. Crank em up to 75mph and they lose about 3mpg! For reference, a 97' PSD F250 extd cab long box with stock tires (265s), 3.55 gearing, a topper, with a custum burned SCT 5 position chip and full exhaust went from a 17mpg truck to a 20mpg truck so long as you drive at 65mph or less. this is a constant and achievable mileage, not a "I was able to hit 25mpg one time will driveing 55mph, with a tail wind, and heading down hill" type of claim.

Enough of that, that 8.1L is a good solid engine and got similar mileage to the early versions of the 6.0 Vortech V-8 and the Ford V10s. Depending on the configuration of the truck you should see 13-14 on long highway runs 10-12 in town and 6-8 towing anything substantial. They have a lot of gunt down low and breath realitively well when you wind them up a bit in the RPM range. I personally have owned a V10 for the last 5 years and run with a buddy that has the 8.1. comparitively speaking the 8.1 is on average about 1mpg thirstier than my V10 under the same conditions. it does how ever seem to have a little more grunt down low in the RPMS but looses that advantage once there wound up a bit. this is primarly due to that extra 1.3L of displacement. his only complaint is for what ever reason, since the day it came off the lot, it's always wanted a quart of oil every 3k miles. I don't think they are all this way but it runs like champ and has been very good. You can't go wrong with one as long as you can come to terms with the fuel mielage.

I've never personally driven his with a load but have followed him to the lake and although he's pulling about 4-5k lbs less than I am (I'm grossing about 22k), I've yet to see any hills he hasn't been able to run 65mph back up to the top, this includes trips between Minot and Bismarck and the two hills west of garrison heading towards douglas bay and indian hills.

I will add that we've both noticed that our trucks use LOTS of fuel ideling. We can drive to the lake 50-70 miles pulling the train and use a 1/4 tank of fuel, but the 4 trips to the boat landing and back, hooking and unhooking the trailers, and a trip over to get bait, a total of about 10 miles, uses another 1/4 tank of fuel.

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davedemo76 Said:
that no bull about getting 25+mpg with a cummins i own a 2002 dodge extended cab long box 4x4 with a cummins with over 200k on it with an edge juice with attitude in it and even on a windy day i can get 25 miles to the gallon at 70mph on the highway highest ive got was 31 at 65mph on a calm day
YarcraftStorm Said:

mallard man Said:
A diesel would be far better for pulling than a gas. A friend of mine just went to Oklahoma and averaged 25 mpg with a 2004 Dodge Cummins that was with the box full with a tool box and 2 Combine rotors. He said that we also get about 30 mpg when he drives it decent. He has the Edge performace chip in it to get this kind of mileage though.

Thats the bigges bunch of hogwash I've read in a while, there's no way in hell that he can get 25mpg emty moreless 30mpg as he claimed. Although I'm an avid outdoorsman my number one passion is trucks and there is NO, NOTTA, NOTHING MADE IN A 3/4 or 1 Ton truck that even get close to those claims! NEVER HAS, NEVER WILL! the most fuel effiecent diesels made were the mid production 7.3L Powerstrokes (96'-98'), a good number of the Cummins for about 94"-02", and some of the early Duramax's could see a tad over 20 give or take with optimal conditions and keeping your foot out of it, that means 60mph. Crank em up to 75mph and they lose about 3mpg! For reference, a 97' PSD F250 extd cab long box with stock tires (265s), 3.55 gearing, a topper, with a custum burned SCT 5 position chip and full exhaust went from a 17mpg truck to a 20mpg truck so long as you drive at 65mph or less. this is a constant and achievable mileage, not a "I was able to hit 25mpg one time will driveing 55mph, with a tail wind, and heading down hill" type of claim.

Enough of that, that 8.1L is a good solid engine and got similar mileage to the early versions of the 6.0 Vortech V-8 and the Ford V10s. Depending on the configuration of the truck you should see 13-14 on long highway runs 10-12 in town and 6-8 towing anything substantial. They have a lot of gunt down low and breath realitively well when you wind them up a bit in the RPM range. I personally have owned a V10 for the last 5 years and run with a buddy that has the 8.1. comparitively speaking the 8.1 is on average about 1mpg thirstier than my V10 under the same conditions. it does how ever seem to have a little more grunt down low in the RPMS but looses that advantage once there wound up a bit. this is primarly due to that extra 1.3L of displacement. his only complaint is for what ever reason, since the day it came off the lot, it's always wanted a quart of oil every 3k miles. I don't think they are all this way but it runs like champ and has been very good. You can't go wrong with one as long as you can come to terms with the fuel mielage.

I've never personally driven his with a load but have followed him to the lake and although he's pulling about 4-5k lbs less than I am (I'm grossing about 22k), I've yet to see any hills he hasn't been able to run 65mph back up to the top, this includes trips between Minot and Bismarck and the two hills west of garrison heading towards douglas bay and indian hills.

I will add that we've both noticed that our trucks use LOTS of fuel ideling. We can drive to the lake 50-70 miles pulling the train and use a 1/4 tank of fuel, but the 4 trips to the boat landing and back, hooking and unhooking the trailers, and a trip over to get bait, a total of about 10 miles, uses another 1/4 tank of fuel.

According to the "mileage readout" on your pickup or according to your calculator using gallons filled and miles driven? 

J

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Allen Said:
This may seem like a stupid question, but if the performance is so much better with the chipped diesel engines, what's the drawback that keeps the manufacturers from using the chip settings as factory original?

There has to be something or Ford, GM, and Dodge (going out on a limb with the last one) engineers have far more data and understanding of those vehicles than anyone at an aftermarket chip manufacturer.

Buddy and I were talking about this the other day. The best we can figure is that they have certain EPA requirements that they are required to meet as well as other specs that they try to get close to to get certain certifications.

Also, the engineers of the motors and tranny's probably know how much to push the engines before you will see wear sooner on any components. 

I'm just guessing btw

J

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YarcraftStorm Said:
I will add that we've both noticed that our trucks use LOTS of fuel ideling. We can drive to the lake 50-70 miles pulling the train and use a 1/4 tank of fuel, but the 4 trips to the boat landing and back, hooking and unhooking the trailers, and a trip over to get bait, a total of about 10 miles, uses another 1/4 tank of fuel.

Hah, and here I thought that was a Ford problem.  I see a very similar pattern in my 09 F250 diesel while at campgrounds.  Beaver Bay in particular this summer. 

I swear you'd think you were siphoning out some fuel to start your campfires.

“Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.” ~ Mark Twain

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mallard man Said:
A diesel would be far better for pulling than a gas. A friend of mine just went to Oklahoma and averaged 25 mpg with a 2004 Dodge Cummins that was with the box full with a tool box and 2 Combine rotors. He said that we also get about 30 mpg when he drives it decent. He has the Edge performace chip in it to get this kind of mileage though.

Hmm, Maybe. But id probably get your friend a calculator.

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