Not real sure about fuel milage, but when I worked with BMW I was always told to run from the 1989 model year because of all the electrical concerns and the replacement cost of the engine. I think the 740 would be a much better car.
Hi, I have almoust the same car, only difference is colour
So fuel economy... hmmm... it`s depend of your driving style:
1) If u`re making full acceleration on every crossroads and do extreme driving it will be about 25 l/100 km.
2) If u`re driving with all other cars (as traffic) and using cruise control - I had 18l/100 km.
P.S. Sorry if I had any grammar mistakes, but I`m trying