Ok, so I have had my M3 for 2 months now and have used the supercharger 4 times, varying battery level rates each time. Normal the best km/hr rate was 670 km/hr ( 417 miles per hour). Went to a supercharger after updating to 32.2 and peaked at 771 km/hr (479 miles per hour). Is this speed normal or new? Showed 115kw and 771 km/hr until about 50% battery then started to slowly reduce which is normal I think.