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Old 01-20-2013, 07:16 PM   #9 (permalink)
Wanting more for less
D.O.G.'s Avatar
Join Date: Jan 2011
Location: New South Wales, Australia
Posts: 297

Metric - '94 Honda Magna 250
90 day: 71.83 mpg (US)

RedCelica - '94 Toyota Celica ZR
90 day: 35.97 mpg (US)

i30 - '12 Hyundai i30 Elite
90 day: 40.72 mpg (US)
Thanks: 20
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Originally Posted by GRU View Post
The stock odometer may not be a gps distance run and see what your odometer shows compaired to gps distance....gps speed to speedometer is not the same as distance
Absolutely correct.

My car had 50 series tyres when bought ( 55 series is standard).
When checked against my GPS over my 52 kilometer commute, the odometer was correct and the speedo fast.
After changing to 60 series tyres, my odometer is 5.7% slow and the speedo about 1% slow.

When calculating my fuel consumption I now multiply the odometer reading by 1.057.

As it happens, I've gained about 5% FE, probably due as much to the Kumho KU25 to Pirelli P6 change as to the size change.

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