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If you have a scangauge or other instantaneous mileage indicator, one way you can determine your car's aeromod potential is to note what your mileage improvement is when you are drafting someone on a flat road, as that is the potential mpg improvement you could get via aeromods. When drafting, the only thing that has changed is the reduced wind drag (which is what aeromods accomplish). Engine, drivetrain, and tire drag remain unchanged. My car is so highly aeromodded that I see very little improvement when drafting. Likewise anyone drafting me would see very little improvement in their mileage
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