My big concern is the range the car has. My understanding is that the new M5 gets about 12 mpg and only has a 15 gallon gas tank. This gives it a range of only 160 miles. If I am on a 400 mile trip at lets say 80 mph I would have to stop to refuel about every 1.5 hours to keep the tank above 1/4 full. This is a tremendous inconveience. I am not so concerned about the exra cost of fuel, but am concerned about having to stop and refuel all the time.

What has been the experience so far of you guys who own the new M5?