thats a good point, sort of along the lines of how adding a full camper top to a truck takes away from your mileage by creating a larger suction at the tail end.
I went out and looked at my protege real good after my post, and all in all, the sectional kamm wouldnt really be feasible, not with keeping the lines clean and sloping in towards the middle point.
I did think of another method, which would be a quick detachable kamm, if its made out of light weight materials, it wouldnt be too much of a hassle. the only problem I can really see is how to attach it at the roof line and still give you the benefits.
what Id really like to do with mine would be an extreme mod to the rear end, both the window and trunk, which would be to make it into a hatchback such as the 94 escort 5 door HB had. but if I was to go that route, Id just buy an escort 5dr HB
