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Scan gauge bigger tires MPG accuracy

Discussion in '2nd Gen. Tacomas (2005-2015)' started by fender104, Jan 21, 2012.

  1. Jan 21, 2012 at 9:41 AM
    #1
    fender104

    fender104 [OP] Active Member

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    I just picked up a scan gauge from amazon. I have been wondering if the scan gauge accounts for the bigger tires in the mpg calculation when you adjust for speed, or if it's just goes off of the odometer which is inaccurate. I went from the stock 215's to 31's so its like a 14% difference.
     
  2. Jan 21, 2012 at 3:13 PM
    #2
    fender104

    fender104 [OP] Active Member

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  3. Jan 21, 2012 at 3:18 PM
    #3
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    yes, the speed adjustment is essentially compensating for the larger tires. If you calibrate with a gps til it reads the right speed on the freeway, it'll be accurate within a couple percent on mpg's, distance, and speed.
     
  4. Jan 21, 2012 at 3:18 PM
    #4
    Tvtech

    Tvtech i void warranties

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    Correct me if I'm wrong guys but I think the scangauge is calibrated by running a tank thru it and punching some info in on the next fill up.
     
  5. Jan 21, 2012 at 3:22 PM
    #5
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    Had tons on the old Taco's.... new Tundra is pretty stock
    Thats for the fuel trim on it. You first need to get the speed correct if you have tires that are a non-factory size. Then when that is correct, do the fill up calibration on the fuel trim until the numbers match
     
  6. Aug 31, 2015 at 12:58 PM
    #6
    bluesttape

    bluesttape Well-Known Member

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    What is the best way of getting the speed correct?
     
  7. Aug 31, 2015 at 12:59 PM
    #7
    geekhouse23

    geekhouse23 The "Liftman" - Dr. Funker

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  8. Aug 31, 2015 at 1:03 PM
    #8
    bluesttape

    bluesttape Well-Known Member

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  9. Aug 31, 2015 at 1:07 PM
    #9
    geekhouse23

    geekhouse23 The "Liftman" - Dr. Funker

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    That will handle bigger tires and re-gearing.
     
  10. Aug 31, 2015 at 1:08 PM
    #10
    bluesttape

    bluesttape Well-Known Member

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    Re-gearing? Uh oh... Say what?
     
  11. Aug 31, 2015 at 1:10 PM
    #11
    geekhouse23

    geekhouse23 The "Liftman" - Dr. Funker

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    For an FJ, but just an example:

    [​IMG]
     
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