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I see what you are saying, but your first diagram seems to show that a rear pan is useless on a bluff back car. The middle graph on this last post seems to still show a slight improvement. I hope that one of the experts will give some clarification on this. It doesn't make sense to me that there would not be any benefit to smoothing the underbody, even on a hatchback
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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