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I happened to be looking at Porsche's website the other day and noticed they publish drag coefficients for their cars. The base 911 is Cd .29, and the highest-drag variant is the GT2 RS with a giant rear wing at .35.
One thing to keep in mind: sports cars have much smaller cross-sectional area compared to full-size trucks, and their total drag is much lower. That GT2 RS works out to about 0.75 square meter, while the lowest-drag RAM, the outgoing EcoDiesel quad cab, is 1.16 square meters.
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