[aerohead]

Sorry I'm very late to the party.I think Frank Lee hit it on this one.Below transonic flow ( about 250-mph ) a hemispherical fore-body is a much as you would need for attached flow.And those clever wind-tunnel guys have been able to pear it down even to less.Even Hucho's work at VW was to soften the front of the Rabbit only enough to allow attached flow.And a Rabbit doesn't look super aero.but nonetheless,it has perfectly attached forebody flow.The Camaro looks like the nose is extended,the nose is dropped,and above the parachute it looks like there is a very steep rear spoiler.All these things would add up to drag reduction.Some of the photos show the hood scoop taped up,don't know about the grille.That would be a 12-percent drag reduction right there! I don't think Cd 0.20 is a reach.