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Number 1 way to make an aerodymanic antenna: remove it while driving.
Personally I just accept the loss. You aren't going to get a 8.5ft whip to work that's only 1/32 of an inch thick. You also need the diameter for current, which is also limited due to the skin effect.
It might be possible to make an antenna that has a "tear drop" shape, but I'd be afraid that regardless of how you made it, it would have too much strength front to back and not enough side to side, coupled with greater weight. In other words, it may sway and flop all over like a tape measure (only stiffer) and not give to wind and velocity changed, which will probably bend the heck out of the mount.
But hey! Amateur radio is also about expirementation. I've thought about trying some sort of "tear drop" shaped antenna, but I don't have the time right now and don't see the benefits outweight the costs yet. I just did a 400 mile trip and averaged over 46mpg in a full sized car (Toyota Avalon HV) even with the 1/4 wave 70cm/2m antenna on the trunk. When I get my HF antenna NMO mount put on the top I'm going to be taking the antenna off as I drive, since I only do HF at night while stopped and also use different antennas for different bands anyway, including one 15ft telescoping antenna that would not survive me driving around at highway speeds with.
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