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Fuel Milage for your 2nd Gen Taco..

Discussion in '2nd Gen. Tacomas' started by perchie15, Sep 12, 2013.

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Fuel Milage

  1. 8-10mpg

    5 vote(s)
    0.4%
  2. 11-13mpg

    50 vote(s)
    4.0%
  3. 14-16mpg

    283 vote(s)
    22.6%
  4. 17-19mpg

    605 vote(s)
    48.3%
  5. 20-22mpg

    237 vote(s)
    18.9%
  6. 22+

    73 vote(s)
    5.8%
  1. Nov 9, 2013 at 3:22 PM
    #301
    Fifthwind

    Fifthwind Master of None

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    2009 4.0 Off-Road with 255-85-16 Cooper ST at 50psi 65-70mph mostly highway 20.2mpg. At 45 psi 18.7 mpg.
     
  2. Nov 9, 2013 at 5:57 PM
    #302
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    50 PSI ? Holy shit
     
  3. Nov 9, 2013 at 8:52 PM
    #303
    Rich91710

    Rich91710 Well-Known Member

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    Load Range E, not a problem.
    Rides like a covered wagon, but they were designed to go up to as high as 80.
     
  4. Nov 9, 2013 at 8:53 PM
    #304
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    I have E , I know you CAN go to 80 but why travel at 50 on a Tacoma ?
     
  5. Nov 9, 2013 at 8:56 PM
    #305
    Joe D

    Joe D Well-Known Member

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  6. Nov 9, 2013 at 9:01 PM
    #306
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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  7. Nov 9, 2013 at 9:08 PM
    #307
    Rich91710

    Rich91710 Well-Known Member

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    I run my 215's at 40.
    I ran the Sears tires on my '91 Escort at 45... pulled 60k out of them and they were warranted to only 40k... cheap shit tires but they lasted.

    Got the Firestone Destination LE on the 5-lug. It has 53k on it when I bought it, no clue of the mileage on the tires.
    I have over 100k now and they are showing no signs of wearing down.
     
  8. Nov 9, 2013 at 9:09 PM
    #308
    Joe D

    Joe D Well-Known Member

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    You know I've experimented with different pressures and have not noted much difference. It does seems logical that rolling resistance would be reduced with higher pressure. That being said, I'm not sure how much power is required to overcome just that portion of what is required to move the truck (though I'm sure it's out there somewhere). I will say this, I'm not one to ever run the tires below the (vehicle) manufacture recommendation so maybe that's why I'm not seeing the gain? The data label on my truck calls for 29 psig front and 32 psig rear...not sure if it's different for different Tacoma configurations.
     
  9. Nov 9, 2013 at 9:10 PM
    #309
    Rich91710

    Rich91710 Well-Known Member

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    I've been running high inflation pressures since before BO was elected to the Ill state senate.
     
  10. Nov 9, 2013 at 9:11 PM
    #310
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    I meant more along the lines of more PSI gets a diminishing return but you increase the harshness of the ride
     
  11. Nov 9, 2013 at 9:12 PM
    #311
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    That only applies to the stock tires
     
  12. Nov 9, 2013 at 9:16 PM
    #312
    Rich91710

    Rich91710 Well-Known Member

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    There is a slight reduction in rolling resistance on a lightly loaded tire at higher inflation levels, but also there is less sidewall flex and tread squirm, which reduces heat buildup in the tire, and extends tire life.

    I'll agree that once you get to 35 or so, you're reach the point of diminishing returns. Ya, 40-45 will get you a little more than 35, but the difference from 35 to 45 will not be nearly as great as the difference from 25 to 35.
    Beyond 35, the main difference is resistance to hydroplaning....

    Navy tests at Pax River determined that the speed at which hydroplaning will begin is directly proportional to the inflation pressure. This is without regard to fancy tread patterns... they help very little. All that matters is that the tread depth is less than the depth of the water (any tire will hydroplane once the water is deeper than the tread).

    "Speed (in knots) = 9 X the square root of the tire pressure (in psi.)"
    "Speed (in mph) = 10.4 X the square root of the tire pressure (in psi.)"

    28psi = 55mph
    32psi = 59mph
    50psi = 74mph

    Contrary to common misinformation, higher inflation pressures INCREASE wet traction.
     
  13. Nov 9, 2013 at 9:18 PM
    #313
    Joe D

    Joe D Well-Known Member

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    http://www.fueleconomy.gov/feg/atv.shtml

    To me this is interesting. According to the site rolling resistance is 5 to 6%. I guess even if I achieved a 10% reduction in overall rolling resitance I would only see about a half of one percent gain in fuel milage...maybe.
     
  14. Nov 9, 2013 at 9:18 PM
    #314
    Rich91710

    Rich91710 Well-Known Member

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    Except when the designer puts the suspension in the seats, the thing rides like a covered wagon unloaded at any inflation.
    I really don't notice a more harsh ride at my normal pressures compared to where the tire shop sets them when I go in for a rotation/balance.
     
  15. Nov 9, 2013 at 9:22 PM
    #315
    Rich91710

    Rich91710 Well-Known Member

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    Outside of the fact that gasoline engines are incredibly inefficient heat pumps (come on Toyota, we need Diesel!), most of our efficiency losses (on any pickup) is aerodynamic drag.
    Keep your speed down to 60-65 and you'll same a metric shitload of money compared to pushing 5 over the limit.

    My best tanks have been driving in moderate traffic, where I can't quite get up above 60, but I'm not in a constant stop and go. 26mpg.

    My worst tanks have been all highway... in New Mexico and Texas rolling 80. 22mpg.
     
  16. Nov 9, 2013 at 9:23 PM
    #316
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    Interesting , I see my best mileage when I get off island and hit the highway
     
  17. Nov 9, 2013 at 9:24 PM
    #317
    Joe D

    Joe D Well-Known Member

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    Interesting, so using that fomula my fronts hydroplane at ~56mph and the rear at ~59mph. Seems the weight would play a roll but???
     
  18. Nov 9, 2013 at 9:29 PM
    #318
    Joe D

    Joe D Well-Known Member

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    Those all seem like decent numbers to me Rich. I drive interstate I would guess 85 to 90% and I'm really easy on it hardly ever going over 70mph and only using the a/c when required (not easy in the deep south). I'm lucky if I hit 20.5. It's typical for 19.5 to about 20.4. I'm actually pretty happy with those numbers for this truck but, it's the 120 miles a day that gets me.
     
  19. Nov 9, 2013 at 9:29 PM
    #319
    Rich91710

    Rich91710 Well-Known Member

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    Stop and go is a killer.

    Anything below 40-45 and you are not running the TC locked up, so you have huge losses in the transmission.

    My worst indicated mileage on my Ultragauge is after a day of local shopping with my wife... which often includes some freeway... worst one was a few weeks ago when I was reading a tank average of only 15 when I hit the freeway to head to work Monday morning.
    Ended up with around 23.5 for that tank overall.

    45-60 is the sweet spot. 65 is still going to do quite well.
    70 and it'll start dropping, but IMHO, is still a good compromise between maximizing fuel consumption and minimizing frustration of both the driver and those behind him.
     
  20. Nov 9, 2013 at 9:30 PM
    #320
    OZ-T

    OZ-T All of those moments....will be lost.....in time

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    Most of mine is at 45 - 50 and under locally
     
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