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· Registered
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When flying, gasoline weighs 6 lbs. per gallon vs. 9 lbs. of water per gallon. I know the fuel used is regular leaded gasoline, but I doubt that the weight is significant.

Your reasons for worse mileage does hold some validity, but you must look at your driving patterns when comparing the two. Also, I found that the screen's display of MPG can be off by as much a 5 MPG. Don't trust the display.
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