Well another plus for the SG. It's not effected at all from under or over fill and pump issues. So if it says the tank was 44mpg it will be very close. My average is at 42 using the MILES/GAL = MPG math and can vary a great deal and I'm sure over time it's as good as the measured gal pumped.
I set mine up to read HP now. It does not take many to run down the road for sure...
Too bad other SG users have little to offer here