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Since you spend a lot of time at extralegal speeds, it seems like aero mods would be the way to go. Any aero drag reduction acts like a horsepower boost when driving at the higher speeds where aero drag is dominant and will allow you to remain in lean burn at higher speeds and on steeper grades when at speed. And any aero mod that allows you to go faster on the same horsepower will give you better mpg at normal speeds. Since you are into speed, modify your car into a street legal salt flats land speed car. Since most high speed highway driving are on fairly straight roads, salt flats land speed is a better model for performance modding than NASCAR. A fringe benefit of the rounded aero shape is that it is stealthy and harder to pick up on radar. My aerocivic gets mileage in the low 60's while cruising at 80mph in lean burn and a fully aeromodded Insight ought to do even better than that.
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