Bone stock E46 M3's kept getting more powerful with better gas, up to about 96 AKI. Mine would ping on 91 AKI if I was lugging around at low RPM on a hot day. Downshift, and it was off to the races.
I've sort of turned into a hyper-miler. I did a supply run today in Frau Putzer's G01 X3 xDrive 30i. The first leg, 14 miles, was house to Sam's Club in light traffic. I got 40.2 MPG, and that's with the AC on. I had two more stops on the way home, and I had to turn the X3 around after unloading it and before putting it in the garage, lowering my round trip MPG to 31.1. I've had the MPG display adjusted to be accurate. It's only off about 0.25%.