ShadeTree,
copying OEMs is a double edge sword - often what looks like aero work is just styling
I believe it was the chevy volt that had lower drag going backwards - be careful what you copy
as for boattails
you are right - a partial will work
http://ecomodder.com/forum/showthrea...-6-a-6069.html
but the bottom of the boattail is not as important until you clean up the belly
the top and sides have much higher velocity and less disturbed air
thus a boattail/Kamm back have more effect there
But it is not worthwhile to inconvenience your wife for 3.7% FE boost
especially if she is already on board - don't loose your ally