In my case, I can drive 10 miles, 10.6 miles, or 11.3 miles. After a year of testing, they all consume the same fuel. So I take the 11.3-mile route. If the shorter one used less, I would go that way. You have to test it and make your own decisions.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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