Didn't you know that gas mileage was not going to be a selling point of any SUV/SAV, but especially a M variant?

I average about 14 miles per gallon with mostly mixed driving. 18 miles per on the highway. This is in line with my previous M5.

I mean, if your wanting "good" gas mileage, should have gone with the diesel. Or not have gotten a SAV/performance SAV.

J