Quote:
(... but don't forget, this is the wife's car. 
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Maybe I should have been more verbose? WD-40 will melt the residual adhesive. It won't affect the paint, though it might take wax off.
I took a closer look at the airfoil chart. If the vehicle is ~4ft tall, the chart applies to a gap of 1.2ft. But the 6:1 fineness ratio doesn't scale out on my screen. Is the airfoil is in ground effect? The call-out for H implies that.
Thanks for pointing to
gap vs drag coefficient. New stuff there. The post had 20 Thanks but I wasn't one of them so I added myself.