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Also the tractor trailer aerodynamics are quite different from modern hatchbacks. They are tall and narrow, and have high % of airflow on the sides. Hatchbacks like Prius C have more air flowing over the top. Mitsubishi Mirage even have A-pilars spread out and uses windshield rain grooves to redirect flow over the roof. Observing C in the drizzle tells similar story, but may be not to the same extend.
If you think getting 38 MPG at 73mph is sweet, regular Gen3 Prius was getting about that much at 80-85mph going up 4% slope on I-40 in NM, abait at higher elevation and warmer temperatures. Just another testimony to efficiency of longer body and Kammback design.
I am seeing more and more new cars (Toyota, Subaru, GM) which incorporate VGs into trailing edge of undertail belly panel. Are they really helpful or they just easy to mold?
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