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  1. #1
    Jr. Apprentice
    Join Date
    Dec 2009
    Location
    Somerset, KY
    Posts
    20

    Default Fuel mileage plus tail-gates

    I got a question, does running with your tail gate down improve fuel mileage? Also is it legal. I have heard that running with your tailgate down is illegal, but that could be a local thing here.
    Also how do I find out the size of my fuel tank? I have 95 GMC sierra 1500 Z71. ext cab
    thanks y'all

  2. #2
    Sr. Apprentice sgt_in_usaf's Avatar
    Join Date
    Dec 2007
    Location
    Grand Forks AFB, ND
    Posts
    53

    Default

    Actually, the Mythbusters did extensive testing on this and they found because of how they are designed, you actually get better mileage with the tailgate UP, not down. Having it down or off completely actually reduces the fuel mileage something like 20% (can't remember the exact percentage). Not sure if it's illegal to have it down...if there's nothing in the back, I can't see any cop having a problem, but I personally hate driving behind someone with the gate down or off and stuff in the back...never know if that stuff will fall out from the wind or accelleration.
    Andrew
    Grand Forks AFB, ND

    2001 Chevy Suburban LT K1500 V8 5.3L 4x4
    - 16" Goodyear Wrangler Fortera tires
    - K&N air filter

  3. #3
    Legend unplugged's Avatar
    Join Date
    Sep 2006
    Location
    High Deserts of SoCal
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    2,554

    Default

    Seems logical, that the tailgate down would improve aerodynamics, but it doesn't.
    The mythbusters did some testing and say that it is better to leave the tailgate up.
    The best improvement they got while testing was 5% with one of those mesh nets.
    [ame="http://www.youtube.com/watch?v=r3aqHbD-O9E"]YouTube- Insert from MythBusters - Tailgate Up or Down 2 (from More Myths Revisited) fuel consumption test[/ame]
    There is no way to happiness....happiness is the way.:yipi:
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  4. #4
    Jr. Apprentice
    Join Date
    Dec 2009
    Location
    Somerset, KY
    Posts
    20

    Default

    hey thanks for the info guys. Unplugged, that was an awesome video. I believe them, but mesh? Never would have thought that.

  5. #5

    Default

    Yep, the wind is actually sguirling in the bed and pushing the truck !!!!!!!!!!!!!!!!!!

    SEEN THAT !

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

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