AeroModder -
Yup, that's what I do.
My tires account for a +2% "bonus" when I fill-up. To keep track of what is going on, this is my typical "Details" section of my Fuel Log :
Quote:
|
193217 miles on odometer. Tires are larger, so odometer is reading 2% less, hence +2% correction: 246.4 * 1.02 = 251.328
|
Maybe you can find a pal with a GPS that you can borrow. Hiker dudes usually invest in them. You usually only need about 20+ miles to get a good reading. I put the GPS on my dashboard to make sure it doesn't lose access to satellites, and shoot for long straight lines (i.e. freeways). I am sure it works fine on curvy roads, but I also think that will introduce a tad more error.
CarloSW2