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Foam and fiberglass sandwich structure, sculpted into aero shape a la Hucho.
Maybe do a knockoff of some of the German pre-WWII designs, which were hyper-efficient.
If a two-wheeler is suitable, use Battle Mountain HPV designs for guidance. After all, the latest of these got ~83 mph on equivalent of <0.5 hp.
The more aero the shape & lighter the vehicle, the less power and therefore heat needed to propel it.
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