Very interesing idea.
If you could efficiently get air to blow out via wheelcovers that could be very nice. However I think that with the wheel there it twould be tough to get the air to pass through those wheel holes efficiently. I think the fan blades would be beating up on the air a lot (lots of drag in the fan, that is), with little air actually movng through the wheel.
You'd need fan blades slanted in opposite directions for left and right side of car, assuming you want air going out on both sides. I'd vote for blowing air out, the less air banging around under the car the better, I think.
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Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.
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