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4.56 vs. 4.11 MPG

Discussion in '1st Gen. Tacomas (1995-2004)' started by ChiefThickums, Jul 1, 2010.

  1. Jul 1, 2010 at 10:32 AM
    #1
    ChiefThickums

    ChiefThickums [OP] Scrub

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    Tyson
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    6 in' Trailmaster, 33x12.50's, TRD supercharged, flowmaster, K&N. Used abused and put away wet.
    I finally made the switch from 4.11 to 4.56 and here is my findings...

    I have a 3.4l 5spd 99 taco with a 6in lift, supercharged, flo master, K&N, intake. and run premium gas. Most importantly I run 33X12.50's which put me on the edge of 4.11 gearing or 4.56 gearing.. I pulled the trigger and made the switch and here is the mpg differance...

    with 4.11 gearing I got:

    Between 210-230 a tank
    Between 13 - 14mpg

    With 4.56 gearing I get:

    Between 230 - 250 a tank
    Between 14 - 15.5mpg

    I've never seen anyone post a after gear change results thread , I mainly saw speculation of what you "should and probably will get" instead of numbers. so here are the acctual numbers that i got from my 4.56 cut over. Not a huge diffence but it is some improvement. Hopefully it helps in some people that are on the edge desiding :cool:

    *Note. The speedo on my truck is off by +.05 per mile after the change to 4.56 and 33X12.50's. So in a 10mile block my odometer will read 10.5. So the gas mileage is even better the qouted. accounting for the difference I should get about 262 miles a tank and 16mpg. I just gave real numbers of my trucks current condition with out the variance of the speedo/ecu.
     
  2. Jul 1, 2010 at 10:48 AM
    #2
    jspadaro

    jspadaro Well-Known Member

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    Wait... You got better fuel economy? I had always thought switching to 4.56 would give move your power lower at the expense of fuel.
     
  3. Jul 1, 2010 at 10:49 AM
    #3
    dylandercole

    dylandercole Well-Known Member

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    good info
     
  4. Jul 1, 2010 at 10:51 AM
    #4
    PLC721

    PLC721 Well-Known Member

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    it's puts you back to factory specs, yes you'll be at a higher rpm but it is less strain on the motor....
     
  5. Jul 1, 2010 at 10:52 AM
    #5
    Lurkin

    Lurkin Well-Known Member

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    Depends on your driving patterns and habits. Lower gears (higher number) make take-offs easier, bumps city/low speed mpg. While higher gears should help bump highway milage.
     
  6. Jul 1, 2010 at 10:53 AM
    #6
    PLC721

    PLC721 Well-Known Member

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    precisley
     
  7. Jul 1, 2010 at 11:07 AM
    #7
    jspadaro

    jspadaro Well-Known Member

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    Nifty. Now I just wish i could throw 4.56 gearing into my truck and then have a super-high top gear. That would rule.
     
  8. Jul 1, 2010 at 11:38 AM
    #8
    ChiefThickums

    ChiefThickums [OP] Scrub

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    Yeah Better mileage, honestly i was shocked to. I figured higher RPMs would result in lower gas mileage, especially on the hwy only makes sense right... but no like they said, the way it worked out the motor is working less and i'm getting and brings you back to stock mpg. the result even with a mix of 80% hwy 20% street driving (roughly) I'm getting 1 - 1.5 Better gas mileage.
     
  9. Jul 1, 2010 at 5:05 PM
    #9
    shitroc

    shitroc Master of War

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    nice, good information. just curious to how much it costs for some 4.56 gears, i know i would definitly benefit from a set.
     
  10. Jul 1, 2010 at 5:07 PM
    #10
    PLC721

    PLC721 Well-Known Member

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  11. Jul 1, 2010 at 11:47 PM
    #11
    Digiratus

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    Hate to pop ya'll joy bubble there, but how does the ECU "know" that you've changed gears? Or tire size for that matter. The odometer is fly by wire, meaning there isn't a rotating cable any longer like the old days. IIRC the sensor that reports to the odometer is at the output shaft of the tranny. It reports driveshaft rotations. Far as the odo is concerned, your still running stock gears and stock tires, yet you are relying on what the odo is telling you.
     
  12. Jul 2, 2010 at 12:34 AM
    #12
    DIRT YOTA

    DIRT YOTA Aka EL ROJO

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    ^yeah wut he said....
     
  13. Jul 2, 2010 at 2:29 AM
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    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    If you look up on TTORA about Gearing and MPG. Most guys will tell you that going from 4.10 to 4.56 while running 33x12.5 will Improve you gas mileage.
     
  14. Jul 2, 2010 at 8:56 AM
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    ChiefThickums

    ChiefThickums [OP] Scrub

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    Digiratus,

    You are right my speedo/ECU is off I already tested it against the California highway patrol White Mile Dashes that are put on the road for air craft ticketing. The difference isn't much I think it was .95 in a 1 mile, I hit the mile marker on my speedo just before the pyshical marker. but that means my truck thinks I'm going further then i really am and that means i'm getting Better gas mileage then qouted not worse. I'll get real numbers today while i'm driving around and post them later.
     
  15. Jul 2, 2010 at 9:28 AM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    FlimFlubberJAM
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    4.10 gears, sliders, and lots of buttons.
    When I re geared my Dodge from 3.73's to 4.10's, I went from 12 to 14 mpg, and a good boost in performance. I personally feel that if you change tire size by more than 10%, you should re gear accordingly.
     
  16. Jul 2, 2010 at 10:26 AM
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    PLC721

    PLC721 Well-Known Member

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    i'm seriously considering it since you brought that to my attention at the meet
     
  17. Jul 2, 2010 at 10:40 AM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    IMHO, If anyone goes to 33's on the Tacoma, a re gear is in order.
     
  18. Jul 2, 2010 at 10:41 AM
    #18
    PLC721

    PLC721 Well-Known Member

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    mine are 35's
     
  19. Jul 2, 2010 at 10:46 AM
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    81shark

    81shark Well-Known Member

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    did you account for the gear change in your mileage calcs? ie you mileage reported on your odometer isn't the same as it once was unless you recalibrated it.

    for me, in my car, i went from 2.87 to 3.55 which is like 20% change, and i saw gas mileage drop about the same %
     
  20. Jul 2, 2010 at 2:50 PM
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    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    Definitely in a First Gen, Going up the Cajon Pass with 33's bed loaded with gear for the weekend is pretty tough for me.
     
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