I just took a trip and drove as the romans drove.. doing 75-80mph the entire 260 miles, filled up before and after the trip, averaged 47 mpg.. better than EPA even at those speeds.. my car has extensive areo mods that allow for this to happen , just proves that cars need to be small light and aerodynamic and you can get great mpg's even at crazy speeds.. the better the aerodynamics the faster you can go with out killing the mpg's
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