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road trip?
You know what sometimes helps your average, a road trip.
Take a one-tank-long road trip with an eco-sympathetic friend or even alone (to save the weight) with a long stretch of flat highway involved, and no city driving. When you get home you'll have had mini-vacation and probably a good mpg tank. of course, this means actually blowing through a tank of gas deliberately which I personally find difficult, but not everyone does.
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