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I would vote Cruise diesel or one of the 4 cylinder VW diesels.
This is just the use a diesel is going to shine at. The small gas cars start to drop off in efficiency faster at that kind of speed. I bet the cruise diesel might hit that 70 mpg mistake post at the opposite 50 mph, but should hit 50 mpg at 70 mph.
The raw EPA mileage testing shows it right around 70 mpg in the unadjusted old highway test which stays under 55 mph.
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