I see that much variation all the time, due, I think, to differences in tank fill levels. I try to fill at low speed until the automatic shut-off kicks in, and repeat three times. Even then, I can occasionally add an extra 0.5 - 1.0 gallon after the first click.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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