Join Date: Jul 2017
Location: Missoula, Montana
Every time I fill up I try to do it the same way, bike leaning on the kick stand the same way **, filled to the same level. Then I make a note of the number of miles on the trip meter and divide that by the number of gallons (from the receipt). For example, if I have 103 miles on the trip meter and I pump 1.8 gallons then 103 / 1.8 = 57.2. I'm going to be more diligent about keeping the numbers in a spreadsheet for myself with notes on the riding conditions to see if there are large variations but I don't think there are.
** By filling up with the bike leaning, it avoids overfilling on hot summer days when expansion within a sun-baked tank might make some excess gas overflow.