GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 Last Post byLast Post by
Results 1 to 10 of 33

Hybrid View

  1. #1
    Jr. Mechanic
    Join Date
    Apr 2008
    Location
    Lexington, SC
    Posts
    118

    Default Chevy Duramax MPG - Diesel mpg?

    I just recently purchased a 2005 duramax 4x4 with about 65000mi. I believe that it is the 6.6l turbo. It has a few up grades like a k&n cold air intake and a banks monster muffler. It seem to be getting about 15mpg. And I don’t think that is very good but I am not sure.

    So I decide to run some lucus oil through to see if that may help but I have not run that tank out yet. Is there something else that I may need to check on the truck that could be causing the lack of mpgs? Or is this possibly as good as it gets?
    2003 Avalanche 4x4 with cladding 110k miles +, K&N stock replacement air filter, Skyjacker 8000 shocks, Hawks LTS pads, Summit Racing brand drilled and sloted rotors, Sylvania ZXE high & low beams, leveling kit, 285/70/r17 Michelin M/S

  2. Likes ChevyFan liked this post
  3. #2

    Default

    That's about what I get around town in my 04.5 that I'm trying to sell, which is the same engine as yours. I can get up to 21 mpg on the interstate though. Of course mine also has a Banks Six-gun on it too.
    Joseph


    Airforce Veteran (7 years)


    NRA Life Member

  4. #3

    Default

    15-20 is about normal for the Duramax LLY motor. Do you have your foot in it a lot? I know if this is your first diesel that you probably do like all others enjoying the power. What size tires are you running?

    If want to keep the truck running with no problems ditch the K&N filter. It is the worst thing you could have on a turbo diesel and will wear out the fins on the turbo. Also Lucas oil products are junk and I do not suggest you use them. If you really want to boost up your MPG all you need to do is exhaust from the downpipe back and a tuner. EFI Live is the best on the market but not for beginners. PPE or edge are also good choices.

    If you want a good air filter send me the part number off that K&N and I will cross refrence it and hook you up with a AMSOIL EA filter that will offer much better protection.
    2008 GMC Sierra 2500HD Ex. Cab, Fire Red, 6.6L Duramax LMM Equipped with UTG Rocker Pods


    AMSOIL is the only oil company that...,"Recommends 25,000 mile oil changes","Gives up to four times better wear protection","Warranties your engine against oil related failure"

    Preferred Customers Save up to 30% Click here!!!
    Executive Direct Jobber ZO# 1695636
    Scott Douglass 248-721-1002
    Order online:
    www.1st-synthetics.com




  5. #4
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,386

    Default

    my uncle can get over 24 mpg all day long on his 05
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  6. #5
    Jr. Mechanic
    Join Date
    Apr 2008
    Location
    Lexington, SC
    Posts
    118

    Default

    I am running 285/75/16 bfg at's. The part number off the k&n air filter is F041A12. I do need a new one because the fins on the air filter are messed up. This is my first diesel so I do think that my foot may have some to do with the mileage. Thanks alot for all of your insight!

    Where would be a good place to purchase the PPE or edge products or maybe even the banks six gun? Seeing how I already have the banks monster muffler.

  7. #6

    Default

    Quote Originally Posted by freddie View Post
    I am running 285/75/16 bfg at's. The part number off the k&n air filter is F041A12. I do need a new one because the fins on the air filter are messed up. This is my first diesel so I do think that my foot may have some to do with the mileage. Thanks alot for all of your insight!

    Where would be a good place to purchase the PPE or edge products or maybe even the banks six gun? Seeing how I already have the banks monster muffler.

    I'm not finding that number F041A12, even on K&N's site. Can you send me or post a picture of the filter? Is it cone style?

    Look at AMSOIL's universal filters here. click on See detailed EaAU specifications and photos and see if one matches yours.

    I'd get the EDGE race it is one of the best out there. I have the Edge Juice with attitude and like it, but would like to go to the race.

  8. #7
    Sr. Apprentice ki4kma's Avatar
    Join Date
    Mar 2009
    Location
    Myrtle Beach, South Carolina or really in a little town called Socastee
    Posts
    44

    Default

    Got 05 and we get about 18-21 riding around and about 13-15 towing

    GM Crate 350 w/Summit Racing Performance headers
    flowmaster super 40
    60 series tires
    16' polished alluminum rims
    New Interior

  9. #8

    Default

    Got a consistent 18.75 on a '95 Tahoe turbo diesel. City or highway.

  10. #9

    Default diesel mpg

    hi all,

    Question into what turbo and intercooler is the best to use for the 5L diesel in DARWIN.

    AXT?

    DENCO?

    TURBO GLIDE?

    MTQ SYSTEMS?

  11. #10
    Newbie
    Join Date
    Aug 2011
    Location
    oklahoma city, ok
    Posts
    1
    Blog Entries
    1

    Default

    I have a 2004 duramax 4x4 4door 2500 which i use for a work truck but when im not pulling or hauling any thing i average 20mpg but on the highway i get 24mpg. i have not added any extras or tuned the motor. But i am looking at gettin a 2003 2500hd diesel for an every day driver any one got advice or suggestions?

Page 1 of 2 12 Last Post byLast Post by

Similar Threads

  1. 03 Chevy C4500 Dump Truck Duramax Diesel 14350 Miles NR
    By ChevyFan in forum Chevy Trucks For Sale eBay
    Replies: 0
    Last: 04-02-2010, 02:30 AM
  2. Chevrolet : C5500 Duramax Duramax Diesel Box Truck W/ Lift Gate
    By ChevyFan in forum Chevy Trucks For Sale eBay
    Replies: 0
    Last: 03-18-2010, 11:50 AM
  3. Replies: 0
    Last: 12-13-2009, 04:30 AM
  4. Duramax Diesel
    By Kraziken in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 2
    Last: 10-20-2009, 06:13 PM
  5. Replies: 1
    Last: 06-22-2009, 09:26 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •