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Toneau covers help MPG???

Discussion in 'Technical Chat' started by TacoDawgfan, Feb 14, 2011.

?

Toneau covers improve, no change or lose mpg's?

  1. improve

    15 vote(s)
    25.0%
  2. no change

    40 vote(s)
    66.7%
  3. lose

    5 vote(s)
    8.3%
  1. Feb 14, 2011 at 3:52 PM
    #1
    TacoDawgfan

    TacoDawgfan [OP] Hunker Down You Hairy Dawg!

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    I traded from a Dodge Ram and had an Under Cover put on my Ram after a couple of years. We all hear that they help MPG's. Not in my case. I averaged 15 mpg with the Ram before and people think I'm crazy but after I only average 14.5 mpg. What do you think? Improve, no difference or loss of mpg?
     
  2. Feb 14, 2011 at 6:40 PM
    #2
    MrGuitarguy

    MrGuitarguy Well-Known Member

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  3. Feb 14, 2011 at 6:41 PM
    #3
    carmellocafe

    carmellocafe Begin With The End In Mind.

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    Myth Busters did a pretty in-depth study of this: They found that the best mpg's are to be had by tailgate up and nothing in/on the bed because the wind coming over the top of the cab and down into the bed creates a kind of "vacuum." I've tested it myself. Even driving the highway with the tailgate completely off the truck was much worse than just leaving the tailgate up.
     
  4. Feb 14, 2011 at 6:47 PM
    #4
    TacoDawgfan

    TacoDawgfan [OP] Hunker Down You Hairy Dawg!

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    I saw one where they did about the tailgate up/down, nothing about the toneau as far as I remember.

    I kinda want to get a toneau, but dont want to hurt the mpg's since that is the reason for trading in the first place.
     
  5. Feb 15, 2011 at 5:24 AM
    #5
    tacoriffic

    tacoriffic Well-Known Member

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    The Myth Buster did a fiberglass bed cover and not a canvas one. They said the fiberglass one showed no change in MPG's. But what about all the extra weight of the fiberglass? I had a canvas one on my silverado and it added about 3 MPG's.
     
  6. Feb 15, 2011 at 5:46 AM
    #6
    Jigzor

    Jigzor Well-Known Member

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    When I had my truck I also had a tonneau. 18mpg mixed and 21/22 highway.
     
  7. Feb 15, 2011 at 6:09 AM
    #7
    floridaoccifer

    floridaoccifer Civil Servant

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    I have had a cover for over a year now and NO change... Highway, Interstate, short and long trips... Makes the truck look good though ;-)
     
  8. Feb 15, 2011 at 6:14 AM
    #8
    pizzo

    pizzo Well-Known Member

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    since adding a cover, it increased my mpg only in the highway.
     
  9. Feb 15, 2011 at 6:19 AM
    #9
    Danosabre

    Danosabre Well-Known Member

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    Extang Trifold bed cover,DDM 55W 6000k HID, maglight, Vent visors
    No change for me, but I didn't buy it for that. I bought it to keep my shit dry and "safer"? Outta sight, outta mind.
     
  10. Feb 15, 2011 at 6:46 AM
    #10
    Lurkin

    Lurkin Well-Known Member

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    +1

    btw it's a soft Extang cover so minimal weight gain. Also I had the same results (no mpg's gained or lost) with the same type of cover on my last truck, a Dakota.
     
  11. Feb 15, 2011 at 6:58 AM
    #11
    DEEVON911

    DEEVON911 Semi-pro

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    ^^ This, right behind the back window and front of bed the air kind of circles and that inturn pushes the air over the tailgate. So no drag with tailgate up or down. A cover will not change MPG's either way unless its heavy and then it can lower the MPG's.
     
  12. Feb 15, 2011 at 7:43 AM
    #12
    kryten

    kryten Well-Known Member

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    0 mpg gain or loss for me. I've got a soft cover so there is hardly any extra weight added to the truck. I had this setup since I bought this truck 2 years ago and as I already said, no difference at all for me. Also mpg savings were not the reason I purchased mine for.
     
  13. Feb 15, 2011 at 7:55 AM
    #13
    scottri

    scottri Well-Known Member

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    Cover King Seat Covers, WeatherTech Liners, PopNLock, storage bin locks, N-Fab Step bars, and G4 Elite Tonneau cover.
    I have a hard cover on mine since about May and I haven't noticed a difference at all.
     
  14. Mar 31, 2011 at 9:37 AM
    #14
    Pugga

    Pugga Pasti-Dip Free Since 1983

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    You can't make a blanket statement whether it helps, hurts or does nothing to MPG's since it depends on the vehicle 100%. Different vehicles, different shapes, different air flow characteristics. Even a long bed and a short bed model of the same truck would react differently to a tonneau. On my DCSB, I got a slight increase, an other trucks I've owned I've had it make absolutely no difference at all.
     
  15. Mar 31, 2011 at 9:49 AM
    #15
    KenLyns

    KenLyns Lord of War

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    To get an appreciable drag reduction, you'd need a tonneau cover and a tapered tailcone piece that extends 5-6 feet behind the tailgate, like this:

    [​IMG]

    Big rigs that spend most of their time on the highway have a device available that works in the same principle, but is restricted in length by regulation:

    [​IMG]
     
  16. Mar 31, 2011 at 9:52 AM
    #16
    whippersnapper02

    whippersnapper02 Well-Known Member

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    So pretty much if you buy one you won't get +10 MPG. In the end you drive a brick and you will get brick MPG.
     
  17. Apr 13, 2011 at 8:31 PM
    #17
    georgeandkanoa

    georgeandkanoa the point is simply this

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    My mileage improved a little after the access cover was put on
     
  18. Apr 13, 2011 at 8:37 PM
    #18
    That Dude Tim

    That Dude Tim Toyota Technician

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    No gain no loss, bought to keep my bed dry when sleeping outside and hauling stuff that needs to be dry.
     
  19. Apr 13, 2011 at 8:40 PM
    #19
    Taco-NB

    Taco-NB MMMMM Taco's

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    I only started getting more than 20mpg after I installed my toneau cover.
     
  20. Apr 13, 2011 at 8:41 PM
    #20
    genxer36

    genxer36 Lord of Tomfoolery

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    No change. I was getting around 21mpg before Ethanol was added to gas. Now I get about 18mpg. Ethanol is the mpg killer. Toneau doesn't make a difference. Toneau is great when traveling & you have lots of stuff to carry.

    [​IMG]

    [​IMG]
     
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