Better/smaller fuel tanks. I have a 16 gallon tank on my PT and have never put in more then 12 but have run out of gas and put in 12.5. I have never put more then 10.5 in a 13 gallon tank on Mazda Protege. By hypermilling I fill up my 13/10 gallon tank every two months. That means for 1 month I'm hauling around 5-6 gallons or 36 lbs.
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