When I fill up, I reset the trip-o-meter (the little odometer that you
may reset at will). When it’s time to refill, I divide the number of
miles on my trip-o-meter by the number of gallons that I needed to
refill the tank. If you live up North, your gas mileage will probably
suffer from letting the engine idle for awhile before you drive. In
truth, you really don’t need to let it idle very long at all, maybe a
minute, tops.
Peace,
Carole 🙂