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Formula for correcting odometer error?

Discussion in 'Technical Chat' started by JBeasty, May 5, 2008.

  1. May 5, 2008 at 11:34 PM
    #1
    JBeasty

    JBeasty [OP] Member

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    Northern California
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    None yet
    I'm considering going a bit larger on my tire/wheel size, and was wondering if there is an easy math formula to calculate my odometer error, if I know the speedometer error.
    For example: my stock tire size is 215/70/15 (26.9"), and I may go to a 225/70/16 (28.4"), which would give me a speedo error of 5.8% (a 60 mph reading on my speedo would now actually be 63.5 mph), courtesy: http://www.miata.net/garage/tirecalc.html
    I just want to be able to calculate gas mileage accurately.
    If I multiply my odometer reading X the % error (.058), then ad that to original reading, I should get the correct mileage . . . right?!
    For example: trip odometer reads 320 miles, so 320 x .058 + 320 = 338.56 miles.
    This seams right to me, but I'm no Mathametician. Can anyone enlighten me?
    Thanks, JB
     
  2. May 6, 2008 at 2:17 AM
    #2
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    Eric
    Eastern side of the Sierras, NV
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    Had tons on the Taco's.... new truck is pretty stock
    yep pretty sure you got it there. simply doing 1.058x320 will give you the same answer too.
     
  3. May 6, 2008 at 10:04 AM
    #3
    JBeasty

    JBeasty [OP] Member

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    Northern California
    Vehicle:
    08 standard cab, 2.7L, 4 sp auto.
    None yet
    Oh Yeah . . . duh! I knew it was a good idea to check with someone first.

    Thanks, JB
     
  4. May 12, 2008 at 6:08 PM
    #4
    piercedtiger

    piercedtiger Devout Atheist

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    Jon
    B.F.E., NY
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    06 TRD OR DC SB 6SPD
    Bestop canopy, hood struts, relocated 7-pin, 3" Toytec spacer/AAL, 265/75 16 Yokohama Geolander ATS, Hi-Lift mounted in bed, fog light mod, turn signal mod, locker mod, driver seat mag light mount, step bars, reinforced tailgate, ABS kill switch, black grill surround, bed lights, Brute Force front
    Buy a Scangauge too. That'll let you adjust for larger tires so you have an accurate speedometer reading as well as distance with it's trip meters. I use mine to watch my speed around cops instead of trying to remember it's off 3.54957489 or whatever mph! :D
     
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