535D touring Diesel, 200 KW, electronically limited to 250 Km/h like most of the stronger series cars here. I've checked it to 255 indicated ground speed, didn't dare to go on to try the limiter (w/o the 19" rack). Someone else was faster. That was on an empty highway between Kempten & Ulm. If you do not kick the beast, the 535D has moderate drinking habits. The opportunities to kick it that hard are few.
That must have been some 20 years ago. BMW pump out a new engine generation every 18 months, it looks like Moore's law for some time, less consumption and more power every time.
Gerhard