Perhaps a motorcycle.
The Prius has a very low Cd and a variable gear ratio, so that would be my candidate in a car. If 2 seats were acceptable, the first gen Insight.
Generally any car that gets good efficiency at lower speeds will tend to outperform other cars at higher speeds.
No sense in making a purchasing decision based on this though unless driving 100 MPH is regularly done, in which case, I would buy something with a high safety rating.
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