2007 2500 HD Diesel?
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2007 2500 HD Diesel?

  1. #1
    VOTE! RodnJen's Avatar
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    Default 2007 2500 HD Diesel?

    My sister and brother in law bought a used one with 38k mi. or so. It is very clean and appears to be in great running order.

    My quesion is gas mileage. They have stock-ish rims and tires with no lift and they only got 13.7 mpg on the way out to Havi this weekend (not towing), and that's as good as they have ever seen. This seems low to me.

    My dad and I both have the same trucks with the 6.0 gasser and get the same or better.

    Any thoughts? What mpg's are you getting on your diesels of any kind?

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  3. #2
    29812 kilrtoy's Avatar
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    Air in the tires time for a tune up clean the air filter... are the tires bigger
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  4. #3
    000-OnRe! If Looks Could Kill's Avatar
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    all 3 of mine starting getting better mileage as they got more miles on them,
    last tank with my 03 was close to 19mpg,almost all fwy miles, it has over 130k miles on it

  5. #4
    Screamin SeaMonkees Schi-502's Avatar
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    Default '08 3500 hd

    I get 12 mpg. I've got 106,000 miles on it. It's never going to get better.

    Word on the street is the '08 was forced to achieve SMOG requirements beyond high mpg numbers.
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  6. #5
    Senior Member bp298's Avatar
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    mph makes a difference. on trips, loaded with about 1000lbs of stuff and towing the boat, going to oregon i get 16-17. mostly on cruise at 63 or so. going to texas with cruise at 75, i'll get 15-15 1/2. 98k on my '05... i also have a transfer flow 45 gallon replacement tank for the trips. extra fuel, extra weight...

  7. #6
    " Live Laterally " Dominator's Avatar
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    I have a F350 7.3 w/Hypertech programmer on stage 1 and im getting 21 mpg empty and 19 mpg towing my 19' jet boat. Oh yeah 245k miles and running very strong.
    " NO MOTOR NO BOATER "

    " I'd rather be riding in my boat thinking about God, than in church thinking about my boat ".


  8. #7
    mach26 300's dschifan's Avatar
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    truck is just right about broken in, i have 40k on my 08 2500hd diesel. As said above these LMM motors don't get the mileage due to smog and such. they are great motors with a ton of power and torque, if worried about mileage its definitely not a truck they should have got. 13.7 does sound a little low and probably needs a clean filter, maybe air in the tires and i bet they were driving pretty fast knocking the rpms up which would kill mileage, possible head wind?. Also alot of people don't realize that you have to reset your mpg calculator, if you don't its going to average out all the around town driving with the hwy driving if they are going off of the computer. I always reset mine before leaving town heading out to the river to get my hwy miles per gallon

    Quote Originally Posted by RodnJen View Post
    My sister and brother in law bought a used one with 38k mi. or so. It is very clean and appears to be in great running order.

    My quesion is gas mileage. They have stock-ish rims and tires with no lift and they only got 13.7 mpg on the way out to Havi this weekend (not towing), and that's as good as they have ever seen. This seems low to me.

    My dad and I both have the same trucks with the 6.0 gasser and get the same or better.

    Any thoughts? What mpg's are you getting on your diesels of any kind?

  9. #8
    000-OnRe! If Looks Could Kill's Avatar
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    thanks for the news on the 08, the 1st dmax I bought was a 2001 3500 with a C-Tec servis body(electrician) truck has over 290k miles on it and gets around 15-16 mpg, still has original brakes on it, been looking for a new chassis to put our box on, Been looking for 07-08, now I will continue to look for 06-07, our truck has been a good truck from the start, my brother pulls his 32' warrior behind this fully loaded(service body) truck.
    Unbelievable the amount of power this motor and TRANSMISSION combo has! By far
    the best work truck I have ever bought. We still use this truck dalily. We put a Hypertech chip in it and a K&N filter, other than that completely stock and making us $


    Quote Originally Posted by Schi-502 View Post
    I get 12 mpg. I've got 106,000 miles on it. It's never going to get better.

    Word on the street is the '08 was forced to achieve SMOG requirements beyond high mpg numbers.

  10. #9
    AKA Blownjet 468 Blowncat 509's Avatar
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    the 06/early 07 with the LBZ will get better milage than the LMM due to the particulate trap,
    and "regen" mode If you buy a 2011, those piss squirters got the MPG back and then some


    Out With The Old, In With The New.......Goodbye Blinding Acceleration, Hello Sustained High Speed (in comfort)

  11. #10
    Just Me snoc653's Avatar
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    The 07 duramax should get better mileage than that. They might try an edge tuner or some other brand of preference. The 08s are another issue entirely. They went to a particulate filter on the 08s and that killed mileage. My F350 got right at 12 MPG and the dealership wanted to know how I did it. My buddie's particulate filter fell off his 08 and he was getting right at 20 MPG. Mine almost fell off, but with the change in regulations and the shift to no particulate filters, I traded mine off as the new ones were getting a lot better mileage.

    BTW my 02 F350 routinely got over 20 MPG, after the tuner and exhaust.
    So many projects, so little time

  12. #11
    mach26 300's dschifan's Avatar
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    the duramax lmm motor started in 2007.5, i think this is the motor he is refering too. if it was the older motor it would definitely be getting more mpg.

    Quote Originally Posted by snoc653 View Post
    The 07 duramax should get better mileage than that. They might try an edge tuner or some other brand of preference. The 08s are another issue entirely. They went to a particulate filter on the 08s and that killed mileage. My F350 got right at 12 MPG and the dealership wanted to know how I did it. My buddie's particulate filter fell off his 08 and he was getting right at 20 MPG. Mine almost fell off, but with the change in regulations and the shift to no particulate filters, I traded mine off as the new ones were getting a lot better mileage.

    BTW my 02 F350 routinely got over 20 MPG, after the tuner and exhaust.

  13. #12
    Ralphs club member LSXINDUSTRIES's Avatar
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    Old body style or new body style? If its NBS....its the DPF killing your mileage. Take that puppy and the cat off, tune it, and it should be able to punch out 18-20 mpg, if you drive under 75 and take it easy on the throttle.
    “I am on a drug. It’s called Charlie Sheen. It’s not available because if you try it, you will die. Your face will melt off, and your children will weep over your exploded body.”



  14. #13
    Senior Member UHHH SUCKA's Avatar
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    I got the early '07 LBZ, with 28K Miles, 40" Tires, stock rear end and getting about 12 MPG on the street and 16 MPG on the Highway beleive it or not. Towing to the river with about 7,000 lbs. I am getting about 11-12 MPG, with no headwind and cruising about 55. Trick I was told by a GM Diesel Mechanic is to let these engines breath and let it out. Only thing I did was bolt on Turbo back pipe, 4" piping all the way back with Muffler only, and
    K & N Filter. No programmers or chips installed or ever will be. I also heard the more miles I put on it the better the Gas Mileage I will see. Might be a while for that as the Truck only see's about 500-600 miles a month.
    Last edited by UHHH SUCKA; 04-18-2011 at 06:49 AM.

  15. #14
    Bah... HST4ME's Avatar
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    08 3/4 20-22 mpg @ 70 - 75 with 3.73's non towing, 17-18 weekended up. Pulled a 38 fever to Lake Cumberland last fall and averaged around 15 driving like a normal person.

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