"Total fuel saving for the duration of 4 month trial : $1800 USD"...."Overall vehicle handling was improved"...." Improvement in fuel economy of 6.06%"...." We are pleased with these results..." Mr. Bill Dinino Fleet Manager OK Transportation....."

umm ok on a semi i'd probably believe it as that big @ss box is going down the road.

 

they do have a drag being what they are, but the benefit of not trying to force the air to follow the shape of the car is a much bigger effect. the rear window is too big a slope for the air to follow, as is the back of the trunk lid, the wing suffers too, note the tabulator or gurney flap that is sold. the designed effect is to cut the air so it is not bound to the shape of the car.
Still, benefit to silly look is not that positive.

 

why do you think the econ nuts design solar cars with such slippery shapes? air drag is big at speed. now take that slippery shape and try fitting four people in it. it will require aerodynamic bandages to even approach the original cd.

 

i thought it was funny. there was another thread about these. just wondered if anybody else thought so

 

That was funny. Just a blank sheet of paper.