Efficiency was still worse, since diesel has about 12-14% more energy per gallon. If they run the cars fast enough they'll hit a point where a Corvette's efficiency is about the same as that of the Prius, but PR stunts are just that.
Edit0-Running a ~500 mile highway test then adding 100 miles city doesn't really equalize much. Halfsies I could see, but then they probably wouldn't have gotten similar mileage.
Edit1-Someone needs look up the definition of energy...
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"the Prius should take less energy than the BMW to maintain a constant cruising speed." Not so.
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