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bigger tires less mpg? What's your experience?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by yellowdotz, Apr 13, 2013.

  1. Apr 13, 2013 at 5:51 PM
    #21
    92dlxman

    92dlxman drinking whats on sale

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    or just multiply your odometer reading by the increase in circumference to figure your actual mileage
     
  2. Apr 13, 2013 at 5:55 PM
    #22
    BenWA

    BenWA Well-Known Member

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    I'm running 285/75/16 Duratracs. Negligible difference in mpg from stock BFG Rugged Trails, maybe 1 mpg difference if that. I have a suspicion that those who cite a more siginificant mpg loss from bigger tires are forgetting to make a correction for the added tire circumference in their mpg calculations. You just need to look up the spec charts of the tire manufacturers to find the true outside diameter. Using my Duratracs as an example, the difference in circumference between stock Rugged Trails and 285/75/16 Duratracs is 8%, therefore you need to add 8% to your odometer readings before you do the mpg calculation.
     
    Last edited: Apr 13, 2013
  3. Apr 13, 2013 at 5:56 PM
    #23
    yellowdotz

    yellowdotz [OP] Well-Known Member

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    when you say that you are taking into consideration the increase in the circumference in your tires and factoring that into your mileage calcs?
     
  4. Apr 13, 2013 at 6:02 PM
    #24
    yellowdotz

    yellowdotz [OP] Well-Known Member

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    is your odometer calibrated to guage the larger circumference of the tires? How do you measure your mpg after you upgraded your tires?
     
  5. Apr 13, 2013 at 6:16 PM
    #25
    Bobbb

    Bobbb "Rumors of Bob, but never Bob. It is Bob, right?"

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    I should add that the 1-2 mpg loss I stated above is with 90% highway/5% city/5% OR driving. These tires are heavy (E-range Toyo OC M/T) and I do have to give it more go juice off the line than I did with stock. If I was doing more start/stop city driving then my dropoff percentage would probably be worse.
     
  6. Apr 13, 2013 at 6:48 PM
    #26
    yellowdotz

    yellowdotz [OP] Well-Known Member

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    guys you do have to keep in mind the circumference and factor that in to your readings. Otherwise you're misleading ppl. Odometer readings are not accurate if you up ur tires and do not tune your odometer to read the upgrade.
     
  7. Apr 14, 2013 at 8:51 PM
    #27
    DevL

    DevL Well-Known Member

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    13 mpg after correction. 12.5 mpg without 17 before so almost 25% lost. Its worse on highway mileage since the rpms do not matter for fuel efficiency, contrary to the lies you will hear that say they do.
     
    Last edited: Apr 14, 2013
  8. Apr 14, 2013 at 9:03 PM
    #28
    DevL

    DevL Well-Known Member

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    I knew it was no 4x4 just looking at the mileage. ;)
     
  9. Apr 17, 2013 at 3:20 PM
    #29
    Deanno33

    Deanno33 Member

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    I am torn on this topic and keep reading post after post. My new truck should be here tomorrow and I want to swap the BFG trails right away so the shop gives me top $. Really want the look of the 265 75 over stock 265 70 but prefer not make mpg less. BFG 265 70 stock weighs 38lbs and is semi aggressive tread. Firestone Destination AT 265 75 is 42 lbs and inch taller. Destination isn't too aggressive for an AT. Estimates on mpg loss? Anyone make same change?

    My new ride will be 2013 dbl cab trd or

    Thanks and nice to be back...been taco less since 2010 when I traded my 2007.
     
  10. Apr 17, 2013 at 5:10 PM
    #30
    Gincoma

    Gincoma Special Edition Member

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    I get better gas mileage with a one size up tire I was running 265/70/17 on my last Tacoma and increased mileage on freeway cause it dropped my RPMs crusing at 75mph with stock tires I was sitting at 2300 rpms with the 265/70/17 I was 2100 rpms so made my mileage better, in the city I didnt notice a loss and this is with BFGoodrich All terrains 6 ply
     
  11. Apr 17, 2013 at 7:17 PM
    #31
    yellowdotz

    yellowdotz [OP] Well-Known Member

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    i can't wait to get bigger tires and trd rims...just gonna run my rubber till it wears. thanks for the info....good shit
     
  12. Apr 19, 2013 at 6:15 PM
    #32
    DevL

    DevL Well-Known Member

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    You drive downhill both ways? Because your lifted truck is better than stock lol.
     
  13. Apr 19, 2013 at 7:40 PM
    #33
    moondeath

    moondeath Plenty of slaves for my robot colony?

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    I lost approximately 1-2 mpg after calculating for size difference. Went from 265/70-16 to 265/75-16. I really notice a difference when I do more 'city' type driving.
     
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