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2) The mutilation of the Speedster roofline, compared to the Coupe results in a 10.4% Cd penalty.
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I find this assertion surprising. Does your home library give a CdA for the coupe? What do you mean by mutilation? How much mitigation with a 3/4 tonneau? I proposed a roll-down windscreen.
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1) Speedsters have a 170-pound weight advantage, compared to coupes.
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What weight baseline? I see reports from 1698 to 1874lb. This car's owner estimates 1300lb. That's 400-570lb difference. Did you notice all the speed holes in the seats, pedal and brake handle?
100 MPG was an aspirational goal. Has anyone achieved that other than Aerocivic?