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Went from 17" rims to 18" and get 10% worse MPG

Discussion in 'Wheels & Tires' started by TheRiddleOfSteel, Mar 23, 2011.

  1. Mar 23, 2011 at 8:40 AM
    #1
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    I have not forgotten you, I love the look, but my MPG went from 320-330 (with the stock 17" TRD rims and nitto 265/65/17) down to 290-300 (with 18" rims and nitto 285/60/18) which was a big (bad) surprise
     
  2. Mar 23, 2011 at 8:45 AM
    #2
    macgyver

    macgyver Well-Known Member

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    You put a bigger and heavier wheel/tire combo on the truck and didn't expect to lose MPG's?
     
  3. Mar 23, 2011 at 8:45 AM
    #3
    CaptainFun

    CaptainFun That Guy

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    Do those numbers account for the size difference affecting the odometer?
     
  4. Mar 23, 2011 at 8:53 AM
    #4
    smurf taco

    smurf taco Well-Known Member

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    dude you went to a bigger tire!! of course you will lose mpg and the rim is heavier just like mcgyver said lol
     
  5. Mar 23, 2011 at 8:54 AM
    #5
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    a little, but not 30 miles/tank
     
  6. Mar 23, 2011 at 8:54 AM
    #6
    Andrew H

    Andrew H What is this "search" you speak of?

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    See build thread.
    seriously man. 285s are significantly wider than 265s. more friction and more weight.
     
  7. Mar 23, 2011 at 8:56 AM
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    CaptainFun

    CaptainFun That Guy

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    Have you corrected the miles traveled?
     
  8. Mar 23, 2011 at 8:56 AM
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    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    interesting, I hadnt really thought of that because its such a small increase, it wasnt enough to affect the speedometer, so Id figure it might be like a 3%-5% difference there
     
  9. Mar 23, 2011 at 8:57 AM
    #9
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    is there some easy way to do that? I looked at the tire size/metric converter stuff before when comparing tires....but this looks like a few more steps and Im not math professor
     
  10. Mar 23, 2011 at 8:59 AM
    #10
    smurf taco

    smurf taco Well-Known Member

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    :smack:its just something you have to deal with...
     
  11. Mar 23, 2011 at 9:09 AM
    #11
    CaptainFun

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    I entered in you wheel/tire specs and the revolutions per mile are off by about 3%. I think, emphasis on think, that indicates you are actually traveling 3% further than your trip odometer says. This combined with you heavier wheels and tires could account for you lost MPG.


    Someone please critique that for me.:D
     
  12. Mar 23, 2011 at 9:16 AM
    #12
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    I had guessed 3%, so maybe Im a math genius but do it subconsciously
     
  13. Mar 23, 2011 at 9:19 AM
    #13
    krimson

    krimson Nothin

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  14. Mar 23, 2011 at 9:34 AM
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    CaptainFun

    CaptainFun That Guy

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    The weight issue cannot be overstated. Increased unsprung weight of larger wheels and tires has significant impact on the vehicle's overall efficiency. Uneconomical driving habits with heavier wheels/tires cause even more drastic impacts.

    Good luck.
     
  15. Mar 23, 2011 at 11:06 AM
    #15
    KPT

    KPT sees what you did there.

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    I'm not sure why you are surprised :notsure:
     
  16. Mar 23, 2011 at 11:21 AM
    #16
    The1youluv2hate

    The1youluv2hate Well-Known Member

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    Duhhhh .. Plus take it easy on the gas pedal
     
  17. Mar 23, 2011 at 11:43 AM
    #17
    Bama_TACO

    Bama_TACO ROLL TIDE!!!!!!!

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    I went from the stock 17" Sport wheels with 265/65/17s to 18x9s with 285/65/18 Load range E Nittos. They are significantly heavier. I only lost 1.5 MPG. I knew there would be a decrease and I can live with it. If you didn't correct your distance on your figures above, then you actually went about 309 instead of 300.
     
  18. Mar 23, 2011 at 2:32 PM
    #18
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    some people seem to be missing the point, it isnt that Im surprised the mpg changed, I just expected it to be less
     
  19. Mar 23, 2011 at 2:37 PM
    #19
    TheRiddleOfSteel

    TheRiddleOfSteel [OP] Well-Known Member

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    mpg is part of the reason I went 285/60 instead of 285/65 (which was supposedly a lot heavier tire)
     
  20. Mar 23, 2011 at 2:40 PM
    #20
    97yota4wd

    97yota4wd Well-Known Member

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    alot of metal, small engine, decent travel.
    caged, camburg long travel, 50t leafpack (soon to be installed) light rack over cab, 5pt harnesses etc
    something we deal with having big tires..:taco:
     
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