12mpg average???? I've no idea on 540i fuel cosumption so maybe thats right?
Mine's sitting at 17.8 mg average has been for ages, lowest it's ever been is 16 ish average. My daily commute is 25 miles round trip, i use it everday, and that coupled with the odd use at night will see you about 80 quid/week easily. I got offered a nice E60 the other week, although they're brilliant cars for the money I'm not a fan, and when I got told it does 12mpg average I immediately crossed that one off the list, and thats coming from owning an M5 already!!!! Great cars for the money and not that expensive to maintain unlike the newer generation cars.