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Nothing new. 20% is on the low side. But that's probably due to the poor results from the cooing package. The wheels and wheel wells can make up to 35% of total aero drag in passenger cars.
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It does seem on the low side. Perhaps it was tested in fixed floor wind tunnel. I always remember the Hucho drawings of basic car shapes at ~.07 and when wheels are added it jumps to ~.16.
Does this mean the once the grille is 100% blocked the wheels suddenly account for almost half of the drag?