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Is it illegal to have chemical smoke trails on US roads?
Why not build a grid array of smoke trails and mount it on your from bumper. Use the smoke trails that that skydivers use, go out on highway and you have a real world wind tunnel better than any tuft testing. You'll even be able to see the actual wake the car leaves behind.
You will need a chase vehicle filming, but it'd be your cheapest best option.
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I try to be helpful. I'm not an expert.
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