[spacemanspif]

I'm loving some of the things BMW did with that 4-series. The back has a small kammback it looks like, aero wheels, grill shutters AND the vents that were the reason why I started this thread. If anything, I think BMW proved my idea that cars with some kind of fender bulge might benefit from a small hole cut in the rear of the bulge. Ideally this would be experimented on a car with an already messed up fender from an accident or small animal impact. Something tells me that this won't increase MPG by 500% but I wonder if it's something that might show increases outside of the normal noise if checking MPG...

And could maybe be a more simple, more attractive mod than front wheel skirts that nets almost the same gain...maybe??