Quote:
Originally Posted by cbaber
In my 98 Civic, the speedo is off, yet the odometer is right on the money in factory form. Since I have over sized tires, I have to add 5% distance to my MPG calculations, but it corrected the factory speedometer to GPS indicated speed.
I originally believed that since my speedometer was indicating the GPS speed, my odometer must be accurate. Guess not!
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It's not only Hondas, I found similar inaccuracy with my Mazda.
On standard size tyres, the speedo reads fast & the odo reads slow (compared to my GPS).
On the taller tyres I run now, the speedo is correct and I multiply the odo readings by 1.057 when calculating my MPG.