You drive 30% further on the longer route and get 10.8% better mileage so the better mileage just isn't enough to make up for increased distance.
I do something similar but I drive further to avoid what was the most expensive toll road in the nation when it opened, it would cost me $2.75 each way to save 5 miles distance each way, it's just not worth it in a car that gets 40+ mpg...but all those SUVs don't seem to mind at all.
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