Not really. Any speed you loose from the extra weight you gain from better aero. The problem being you would need a larger gear spread to effectively power it, but since bike drivetrains have ~18-24 gears it's not as much of an issue compared to a car.
A nice example of this is on the bike power/speed calculator. Calculate the speed at 160W using a mountain bike, and then a streamlined trike. The difference is huge ime.
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.