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06-14-2010, 09:57 AM
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#1 |
 Drives: 07 Yaris Sedan, Auto Join Date: Jun 2010
Location: SE Texas
Posts: 327
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calculating mpg with 195/60R15 tires
i just bought a used yaris and the previous owner put 195/60R15 tires on instead of the stock 185/60R15. i found a tire size calculator that said my tires were slightly bigger and my speedometer would read 1.98% too slow.
so, in order to accurately calculate my mpg i would take the mpg figure i come up with and multiply it by 1.0198, right? |
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06-14-2010, 11:21 AM
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#2 |
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Half a Bubble Off Plumb
Drives: 2009 Yaris Sedan Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
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Yeah, maybe, but that's nitpickier than I'm willing to be.
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06-14-2010, 12:02 PM
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#3 |
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"LibertyRides!"
Drives: 2010 Yaris 3Dr LB | 2020 Stang Join Date: Mar 2010
Location: State College, PA, USA
Posts: 576
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So, according to this calculator your speed is 1.98% too slow on your speedometer? I would imagine this would be a fair assessment.
Say you rounded up to 2.00%. Then traveling @ 60mph according to your speedometer... you are actually traveling 1.200mph faster - 61.2mph. Yes this is right... you would need to multiply by 0.0198 (or 0.0200) and add to the mpg figure if you want to be accurate. Cheers!
__________________
~ Mark ~ 2010 Yaris 3-Dr Liftback, 5-Speed Manual, P185/60R 15, Bayou Blue Pearl I Love my YARIS  - (Click below to see Gaslog): Most miles Tank: 538 tank/10.148 gal = 53.015 MPG / Most MPG: 54.95 MPG (ethanol) 425 tank/7.73 gal "The evils of government are directly proportional to the tolerance of the people." -- Frank Kent |
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06-14-2010, 07:11 PM
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#4 |
 Drives: 2008 Yaris Hatchback Join Date: Jan 2010
Location: Alabama
Posts: 64
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Best to use a GPS and compare the trip on the car and on the gps.
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