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You can't make a decision on just one part of the trip. You have to evaluate the whole thing.
Say you normally get 30 mpg over the 10 miles on route A. If route B is 15 miles, you have to get 45 mpg to make up for the additional distance. Normally, the shorter trip always wins unless you have a drastically different driving environment. I suggest getting a scangauge if you don't have one already.
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