[elhigh]

Welcome,

There are several BMWs listed in the garage. If your mileage results are that bad, it would make your ride the thirstiest Bimmer in the book. There are a few M5s listed that state a lower EPA rating, but evidently the owners couldn't be bothered to do more than just list their cars the one time.

If you're into elbows-out driving, I'll bet you're running some sticky tires. That's going to hold you back some.

Air control is your friend. The less of it actually banging into parts of your car, the better. Barring that, if you can shove it to the side once instead of having it bang and tumble and bang again, do that.

A driver unwilling to make compromises toward the goal of higher mileage is going to have very limited results. The M3 is an entertaining ride but really - how much of that capability can you use on your commute without getting lit up by the highway patrol? Shenanigans on the road = unpleasant introductions and giving your autograph to people you'd rather didn't have it.

If your car is on 18" alloys, will smoothie wheel discs even work? Gotta have that little rim for those clips to grab.

Open a garage page for your car. "M3" only tells us it's a 3-series with a gym membership. How old, what equipment etc.