Hello all,
I'll go out on a limb and say I'm a maintenance\records freak myself. I do the computation the old fashioned way. Reset Tripometer and fill tank until Gas pump stops pumping. Drive around until I want or need more gas. Fill tank again until pump stops pumping. Take total miles driven on Tripmeter and divide that by total gallons poured into tank. Whaa Laa!! I average through 16 weeks of discribed procedures 16.43 MPG. Not bad considering.

Aloha