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even though you're trying for the best mileage possible, if you drive a longer distance it could negate any gains in mpg. if one way is 50 miles and i get 20 MPG (2.5 gallons used), and the other way if 30 miles and i only get 15 MPG (2 gallons used) it makes more sense to take the shorter route due to lower gas consumption, even though the mpg is lower
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