Between 18 and 30mpg is fine, the 320d only did 400 mile per tank (£90 to fill) so not that economical in the real world as that equals 27.5 mpg per gallon of mixed driving yet the Computer would have you believe it was doing 37mpg on average!![/QUOTE]There must be something wrong with that I got a 320d and get 600 mile to a tank and it's been chipped