Anyone with aero software to test if a taller aero roof compensates area increase?
 

So we can finally prove or dispell the myth

http://ecomodder.com/forum/showthrea...-suv-8918.html
This one got me scratching my head for several months.

roof
 

I don't have software,but in the process of putting a scrapbook together I re-visited some work by Hoerner.He was with Messerschmitt during WW-II and was close to design and testing of warbirds for the Luftwaffe.
One of his tables depict a gun barrel fairing of lowest drag which actually increases frontal area with an overall,net drag reduction.
I realize that this would be a 2-dimensional flow regime,but it nonetheless does demonstrate a benefit WITH the bulge.
It makes Don Burr's work more plausible.
Camber and momentum into the wake are big benefits.There must be a crossover point.

Hucho talks about it and there's even a discussion about it here on EM complete with Hucho's illustrations but I don't feel like searching for the link.