Originally Posted by Rememo
Th lack of ethanol is definitely part of the better mileage, but using the computer based mpg could be inaccurate.
Hand calculate the mileage a few times. I'll bet it drops a bit.
It seems there is an extreme minority that reports this much better mileage, except those following sgoldste01's rules. Maybe it's the no-ethanol mix, although jomofree must be using avgas, as Iowa and Minnesota both have ethanol in their gasoline, and I would guess avgas would give substantially better mpg.
On the whole, I am skeptical of the actual mpg, as to go from 400 miles at 39 mpg to a total of 42 mpg for the 750 miles means the 350 miles were at least 45 mpg, and at 75 mph...
Methinks calibration of the dash gauge is in order...