SUV = Aero Brick
People still buy them
I think there's plenty that can be done to morph them into somewhat efficient machines! I see on these forums that a lot of focus is put on the frontal area, but I have see mods that reduce frontal area that completely ruin any gains by creating immense drag on the overall car due to the inefficient shape that is left behind. (i.e. the chopped cars with flat roofs and hard angles left over) With an SUV, I feel you are presented with an opportunity for success, rather than starting with a failure, because there are already so many things wrong.