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In addition, there is another twist in calculating FE. For example, my present average is about 41-42 mpg. I can easily get 46 mpg if I take another route to and from work. However, that particular route is long enough to cost me an extra 12 more cents a day in gas than the route with lower mpg, which is shorter. Therefore the FE of the engine and the FE of the route are in conflict.
My ego makes me want to take the higher mpg route so that I can brag about my efficiency. Logic and my conscience demand I take the more efficient route, which has lower mpg.
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