Odometer correction factor

[ghassler]

I have a few motorcycles that are pretty close to each other in MPG. However I know that some of the speedometers / odometers are more accurate than others. It would be nice if there was a correction field in Fuelly where I can enter a number to multiply the mileage by.

E.g. if I track 10 miles via GPS, or mile markers on a highway, but my odometer clicks off 10.8 miles, I would enter "0.926" to adjust my incorrect odometer to the actual mileage, producing more accurate - and more comparable - MPGs. All mileage numbers for that vehicle would be multiplied by this correction before calculating MPG.

Many vehicle speedometers read high (I think manufacturers err toward a high reading for liability). Tire wear and inflation can have some affect on the ratio, but in general I find 5%-7% error to be common.