How's your fuel consumption doing? Mine's dropped to 30 now I've been driving it more enthusiastically. The car MPG reading is 10% out too - it says 33, but it's only 30 when compared to real brim to brim consumption.
30 might be quite good for a 535i, I'm not sure, but I do know that with my usage pattern I always get about 10% less than the official EU combined figure for every car over the last 15 years... until now. This one is 33% less! I seriously doubt that BMW ever got the 44.1 they claim because the best journey I have achieved so far is 37 (car read 41). I would be interested to hear if you are doing any better in case mine's not working properly