Originally Posted by iansoutham

Yes it can be that good.

Mate of mine had his 530D M-sport 2007 model remapped and the fuel economy went from 38mpg avg up to 52mpg. That is with someone driving everywhere on A-roads @ about 60mph on an auto box. I used to drive it and could get a shade under 60mpg myself, driving it a lot quicker than he used to. Bear in mind that the BMW is probably getting on to be around 2 tonne, so quite a heavy car, and with the M5 alloys dragging it back.