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  1. #1

    Default Need better fuel mileage

    I have a 2006 Z71 and was trying to figure out some ways to get better fuel mileage. Right now I'm getting about 12-13 with an intake and flowmasters. I'm running 305/70/17 nitto's. Any help would be great.

  2. #2


    Probably not gonna be the answer you want but here goes:
    When it comes down to dollars and cents it might not be practical to get a lot better mileage out of your truck.
    Driving habits will account for the largest increase, drive it smoothly and at or just below the speed limit, easy on the gas and coast as much as possible.
    Less rolling resistance on the tires would help ( smaller/lighter tires).
    Less weight in the truck, get rid of anything you dont need to carry around.
    If the trucks lifted lower it back down and lessen the wind ressistance.
    Make sure the engine is properly tuned and all the lubricating oils are properly changed.
    Any additions that cost $ will need to be weighed against the amount they cost, a couple hundred dollars worth of parts will take a lot of mileage to recoup.

  3. #3


    that seems kinda low. do you do a lot of city driving cuz that will hurt. I also think the nittos are heavy tires. I am getting that mileage with my truck, but I do mostly highway. Yours should be getting better than i do.
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  4. #4
    Master Mechanic clgoch187's Avatar
    Join Date
    Aug 2010
    Gettysburg, Pennsylvania, United States


    if you want to keep bigger tires, get some with a less aggressive tread pattern and that will help a little.
    and what kind of roads are you driving on for the most part will effect it a lot too, hill and turns consume more fuel.
    also what motor do you have? im getting 17-19 an avg. with my 4.8.
    03 Silverado 1500
    285/75/16 BFG's
    2 Blaupunkt 10" vW1000 subs in Subthump box
    ProComp Level Lift & 3" rear blocks

  5. #5


    I do almost all city driving. I also pull a sixteen foot lawn trailer and get about 10-12 when I do

  6. #6


    with the setup and driving you do there might not be much to do to help fuel economy. with 33's a gear may be beneficial (to a numericaly higher). it may help in the city as the truck wont have to work so hard to get moving, but will rev higher on the highway decreasing highway mileage. but that is an expensive way.

  7. #7


    The tires I have aren't that aggressive and I live in south Louisiana so...

    ---------- Post added at 06:35 PM ---------- Previous post was at 06:31 PM ----------

    The gears in it right now are 3.42s what would be the best upgrade to go with

  8. #8

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    Have you corrected for the extra height of those tires? They must be almost 34" tall- big tires.
    If they are 2" taller than stock that would be almost 1 more mpg.
    1998 suburban-
    1/2 ton

    199500 miles

  9. #9


    ...and what about programers. It has 76k miles would any maint. help

    ---------- Post added at 06:49 PM ---------- Previous post was at 06:47 PM ----------

    Corrected how?

  10. #10
    Sr. Engineer Sam_A's Avatar
    Join Date
    Jul 2010
    Hattiesburg, Mississippi, United States


    When I put the Bakflip Tonneau cover on my 04 Z71 my mpg's increased by 2 mpg on the highway. I'm saving up to get a cover for my "new" truck.

    ----- edit ----

    It's not the cheapest solution, but it does help and it will help protect the things in your truck bed.
    Last edited by Sam_A; 10-13-2010 at 07:36 PM. Reason: Add info

    2003 Chevy Silverado 2500HD LT 4x4, Crew Cab
    6.6L Duramax Diesel (LB7) with an automatic Allison 1000 5 speed.
    Spray-in bed liner, S&B Air Filter, Homemade CAI ram scoop, ball hitch for Gooseneck
    Black toolbox, metallic-black bowtie, 5.5" NV-200C Bumper Off-Road lights behind a blacked-out grille
    285/75R16E BFG A/Ts
    Future Upgrades: Exhaust, CAI, programmer, intercooler, torque converter

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