Well guys, I got just an old '91 520i M50 with manual tran. with 180.000 km in it, plus 17" Borbet rims, with 235/45 tyres and somehow manage to get 33,5 mpg at 70 mph (with wife, kid and some luggage a/c off). Previously I owned '82 E28 520ia, a real petrol guzler, but I was surprised with my "new" E34.