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The percentage saved is not as important as the quantity used, in my opinion.
A 12MPG vehicle burns 8.33 gallons in 100 miles, and a 60MPG vehicle burns just 1.67 gallons in 100 miles.
Or to put it another way, with a 15 gallon tank, the 12MPG vehicle travels 180 miles, and the 60MPG vehicle travels 900 miles.
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