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Can 285's give you better highway mpg?

Discussion in '2nd Gen. Tacomas (2005-2015)' started by hartzpad, Jan 5, 2010.

  1. Jan 5, 2010 at 7:59 AM
    #1
    hartzpad

    hartzpad [OP] New Member

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    Taco's with the 6 speed manual seem to have lower overall gearing than the Autos, would a swap to 285's possibly give you the same or better gas mileage on the highway by lowering the cruising rpm's? I know there will be more weight, wind resistance and unsprung weight and worse city mileage for sure. Is this possible?
     
  2. Jan 5, 2010 at 8:02 AM
    #2
    Simon2150

    Simon2150 Well-Known Member

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    Well, for me it surely didn't. I have 285s and saw my mileage drop.
     
  3. Jan 5, 2010 at 8:40 AM
    #3
    Jason'sLawnCare

    Jason'sLawnCare Prepared for Bambi

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    In theory it sounds like you should if you don't change speed much.
     
  4. Jan 5, 2010 at 8:41 AM
    #4
    MyToyTaco

    MyToyTaco ╒╪╕

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    same for me here. I lost almost 2 mpg going to 285s
     
  5. Jan 5, 2010 at 9:07 AM
    #5
    OH-MAN

    OH-MAN Well-Known Member

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    They may give you a taller gear ratio to lower RPMs, but they are wider and heavier so you will need more power to push them along.
    I would guess it will lose some milage.
     
  6. Jan 5, 2010 at 9:11 AM
    #6
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    I lost mpg with mine. and even if you were to gain even 1 mpg on the highway you would surely lose it in town
     
  7. Jan 5, 2010 at 9:15 AM
    #7
    BSP4x4

    BSP4x4 Guest

    what about the argument that in order to fit 285's your talking about a lift too and the added weight of that?

    i'm hoping to see an mpg increase from going from 245 to 265's
     
  8. Jan 5, 2010 at 9:25 AM
    #8
    Zombie Runner

    Zombie Runner Are these black helicopters for me?

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    adding a lift doesnt have to add weight. what about billys and the tsb leaf pack? no extra weight there
     
  9. Jan 5, 2010 at 9:26 AM
    #9
    Jason'sLawnCare

    Jason'sLawnCare Prepared for Bambi

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    I think a lift changes the aerodynamics of the vehicle much more than it adds to the weight of it.
     
  10. Jan 5, 2010 at 9:28 AM
    #10
    Jigzor

    Jigzor Well-Known Member

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    Technically the TSB leaf pack would weigh more since it's adding another leaf.
     
  11. Jan 5, 2010 at 9:29 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Is the aspect ratio changing?
     
  12. Jan 5, 2010 at 9:33 AM
    #12
    flatlander

    flatlander Well-Known Member

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    Anyone with stock setup, maybe just the rear spring tsb, gone from 245 to 265 staying with the 75 aspect? I am thinking it will not impact MPG at all?

    TIA
     
  13. Jan 5, 2010 at 9:34 AM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It will to a degree because you are changing the OA tire height. Plus the added weight from increased width.
     
  14. Jan 5, 2010 at 9:38 AM
    #14
    JimBeam

    JimBeam BECAUSE INTERNETS!! Moderator

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    you'll also have increased rolling resistance because you'll have a wider contact patch
     
  15. Jan 5, 2010 at 9:57 AM
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    Ese Loco

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    Can people with a similar experience as the OP described and a MANUAL transmission please chirp in on this one, I'm curious of this myself. Thank you in advance.:D
     
  16. Jan 5, 2010 at 10:01 AM
    #16
    IndigoTaco

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    I went from 265/65/17 to 265/70/17 and lost about 2 mpg. Then winter blend kicked in and I lost about 3 more. Stock height, minus TSB in rear.
     
  17. Jan 5, 2010 at 10:14 AM
    #17
    pataco

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    to answer your question.no way ever.
     
  18. Jan 5, 2010 at 10:16 AM
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    WilsonTheDog

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    Me. I saw no difference in MPG whatsoever.
     
  19. Jan 5, 2010 at 10:16 AM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Correct.
     
  20. Jan 5, 2010 at 11:21 AM
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    Evil Monkey

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    Physics say no. Even if you discount rolling resistance due to a larger contact patch, a taller tire puts the weight of the tire farther out on the diameter. Even given the same weight with a larger tire, which is unlikely because you need more rubber to make the larger tire, the tire will take more twisting force at the axle to turn. It could be a slight change, but it won't be more efficient. Best case is you'll see no change. More likely, you'll lose mpg. Even though you'll see lower RPMs for a given speed, the amount of power required to turn the tire offsets any lowered rpm difference.

    It's a similar concept that figure skaters use when they spin. With their arms out, they spin fairly slow. As they pull their arms in (change to a smaller diameter), the rate of spin increases (easier to turn).

    I have a manual. I lost about 1 mpg going to 285s. It does make 1st gear more useable though.
     
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