I disagree that the point of EM is to cost efficiently Eco Mod our cars- some of us (me lol) have gotten way in over our head on what we planned to spend and did spend...
BUT, if you want to get the most out of the vehicle, get the lightest wheel, then make it smooth. It is easier to take a light wheel and add a skirt or pizza pan, than take an aero wheel and cut weight.
(I don't just waste money on EMing, and cost is really considered, but I do this to maximize FE- I'm not rebuilding my car from carbon fiber, but I am also not sacrificing too much in looks for performance (that only applies to one car).)
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