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Don't forget that RR is not just the tires, but the wheel bearings, seals and brakes too. Add more or less 15% for those.
I don't think they'll get a .25 Cd, not with the shape they're starting with and I've a feeling they won't go all out on the aero. I bet we'll mostly see quick stick or screw on stuff.
Nevertheless, with the small frontal area and light weight, they'll hit their numbers, but not by a huge number if you ask me. The killer will be friction and parasitic losses from the 1800 rpm. That thing will bust 100 mpg at 40 mph though.
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