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03-21-2010, 07:59 PM | #20 | |
Drives: 2008 Yaris Sedan Join Date: Feb 2010
Location: Oklahoma City, OK
Posts: 323
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Quote:
Gasoline weighs about 6.5lbs/gal. So 1.1 gallons weighs about 7lbs. Or about 0.25% of the weight of the car (with me and my suitcase in it). Of course, the *average* added weight over the course of the tank is half that, or about 0.125% of the weight of the car. And on the Interstate, wind resistance dominates. The difference made by the extra weight works out to about 0.02 mpg. However, despite the humorous flights of fancy in the public service announcement, there are enough rational reasons not to top off that I've switch to filling at the pump's slowest setting and then pumping as much as I can by pulling the trigger *ever so slightly*, just once to make sure that the automatic mechanism got it right the first time. It doesn't work out to more than 0.1 gallons more. And the method seems to give me a consistent adjustment factor on the scangauge. -Steve |
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