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BGD, if you only had fuel injection, you could install instrumentation sensitive enough to detect small changes in MPG. Then you'd see, as I have, that driving faster burns more gas, aeromods save gas, and small cars use less fuel than large cars.
But even if all you have is a stopwatch, you can prove to yourself the existence of aerodynamics. Strap a mattress to your roof rack, and time how long it takes to coast down from 45mph to 35mph in neutral on a flat road. Remove the mattress and repeat, heading the same direction on the same stretch of road. If the mattress slows you down, I say it's because aerodynamics is real.
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