Lots of smaller engined cars will need to enrich the fuel mixture to keep the engine components cool at high speed. Something like the Prius may not, if it can get enough power from the electric side of things.
A car with a larger engine may be a better choice. Maybe even really big. A C6 Corvette has a CdA of .55 m^2. They can easily get 30 MPG on the highway. It'd probably do pretty good at 100 MPH too.
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