HMM? question everything that you know to be fact! LOL
Well Ive done similar and had a similar result and also gained slightly more at higher speeds. So I determined distance with combination measurements from yahoo maps and google. I dont know if they factor in cornering etc. but they did fall closer to the distance traveled by Mile marker count on a trip instate.
Afterwards I found things get real messy trying to figure multiple states but I firmly base my weekly mileage against yahoo maps rite or wrong I cant say.
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