The lower your cd or the greater your weight, the more easily your car will exceed the posted speed limits on a downhill run unless you use braking to limit the speed. The aerocivic is also a featherweight at 2100 lbs, but with its low cd pushing its terminal velocity somewhere above 100mph, it will easily exceed 75 mph on any reasonable downhill run long enough for it to build up speed. It doesn't even have to be a steep downhill.
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