I should try that test with the cotton tufts. That is probably the only way to find the ideal spot.
Surely putting vents on would increase FE though. At the very least it would divert air bring forced underneath the car to go over. I'm not very concerned about water though. I want vents that came from a stock Chrysler Lebaron or New Yorker Turbo. I don't think they would let much water in as they are OE. If it does become a concern however I can probably make drip pans or something underneath...
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