Quote:
Originally Posted by 5inYSO
I have never agreed with topping off the tank. I'm surprised I don't see it mentioned more often. With a gallon of fuel weighing approximately 6 pounds and a 20 gallon tank, that's 120lbs. I usually fill no more than 1/2 tank, to save on hauling my fuel around.
Is this really a measurable fuel savings?
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Like most everything, the answer is - it depends.
I don't see any penalty for hauling extra weight because I do a lot of coasting and highway driving. If you do a lot of stop and go driving, you will likely see a drop in mpg due to the extra weight. If you do a lot of highway miles, and especially P&G, you might actually see improved mileage from having extra weight.
For the typical driver, having less weight results in better economy. It's not worth the extra stops to the fuel station though.