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  1. #1

    Default My new baby! Best bang for buck increasing gas mileage?

    I just picked up a 02 GMC Seirra SLE z71 with 61K on it. completely mint with one owner and all service records! The guy claimed he can get 19 on the highway with it which I believe and I am not complaining about that. But I am wondering If I did one mod for increasing gas mileage when towing what would be my best bang for my buck? A tuner?

    I will attach a pic of the truck also!

    So glad to have a GM product again!
    Attached Thumbnails Attached Thumbnails 20140123_130334.jpg  

  2. #2
    Jr. Engineer BRB46's Avatar
    Join Date
    Apr 2011
    Western Mass


    Welcome to GMTC. What a nice looking truck and great odometer reading for a twelve year old. Don't have a recommendation for MPG, but plenty of members will chime in to help. Not sure any one mod will net to many gains though.
    2006 Silverado 1500 5.3L ecsb Z71,afe pro s dry air filter, color matched tailgate handle and bezel,color matched front bow tie, led interior illumination, 5000K HID lows, Black powder coated wheels, Blacked out body side moldings, Rough Country 2.5" level/lift kit, Magnaflow muffler

  3. #3

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    Smaller tires and maybe a programer But how heavy is the trailer?
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

  4. #4


    Congrats on the New Truck, its a Very Sharp looking Sierra!!! far as increasing your Fuel Mileage, there aren't very many Bolt-on Mods that will Increase your Fuel Mileage, where you will see a Good Return on your Investment from that Mod, Going with a Custom Tune, like One from Black Bear Performance, will give you a Very Good Return on your Investment, Other than Pure HP Gains, your Trucks Overall Drivability will be Increased, and they can also do Adjustments to Improve the Shifting in your Transmission, bottom-line, as you've said Best Bang for Your $$$$......below is their Web Site.

    Link to Black Bear Performance,

    EDIT...I'll add the Following,
    Some of the other Items to help with Fuel Mileage,
    ...Keep the Truck Maintain....Clean with Air Filter, a Fresh set of Plugs and Wires, and Cleaning of the MAF Sensor, and Throttle Body and Injectors, and New Fuel Filter.
    ...Keep Tires properly Inflated
    Use the Right Octane for your Truck
    ...If you'll be idling for more than a few minutes, turn the Engine Off
    Last edited by 99'HEARTBEAT; 01-25-2014 at 08:49 PM. Reason: Added Infor.


    5.3 l 3.73 l G80

  5. #5


    Quote Originally Posted by Enkeiavalanche View Post
    Smaller tires and maybe a programer But how heavy is the trailer?
    The trailer is a alumacraft 16.5ft competitor with 30 gal of gas and loaded with gear. Not sure on the weight and in the winter its a small 5x8 trailer with a atv on it.

  6. #6


    welcome and congrats on the new (to you) truck.
    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

  7. #7


    Quote Originally Posted by theflatlander View Post
    The trailer is a alumacraft 16.5ft competitor with 30 gal of gas and loaded with gear. Not sure on the weight and in the winter its a small 5x8 trailer with a atv on it.
    Do you know what Gears, and what Size Tires the Truck??

  8. #8


    Keeping in mind that "bang for the buck" is your underlying qualifier, there are few, if any single mods that will achieve that. However, the first thing to do is to be sure it is in top running condition. Also, maybe a Seafoam treatment to clean out the intake and injectors would not hurt, only about $9. Make sure tires are properly inflated (as our wise President told us all). Drive easy, and keep it below about 72 on the highway. Looks like a great truck!
    Las Vegas, NV...2001 Silverado 1500 LT Z71 Stepside X-cab, 171,000 miles, 5.3, cat-back duals, leveling kit, 3.73, 17" rims, more to come...

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