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Find the best CdA that you can. If you can modify the vehicle, pay close attention to the road-load at 100 mph and optimize the final drive in top gear to coincide with a high efficiency region of the BSFC map. You could do this on a BSFC map (assuming you can find a published map for your engine) by estimating road-load power and fitting lines of constant power across a BSFC map. Look for minimum BSFC at the 100 mph road-load power and select your gearing.
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