But if i'm slowed down, would going to the trouble and expense and potential ridicule of funny looking aero still make as much of a difference?
There are some routes/situations where I have no alternative but to drive fast like my daily commute, so I plan to aeromod my compact when I get a chance. When i'm hauling stuff I can go as slow as I like though because that's during downtime. Will a whale tail even help much at 40mph?