My mother once told me a story when I was real young, about a guy who went to buy an expensive yacht. After looking over the yacht, picking out the one he wanted, interior and all the accessories, he sits down with the salesman to write up the sale. Just as he is about to sign he asks:

"So how many gallons to the mile does this get?"

Before he could sign the salesman, grabs all the papers and even the pen gets up and leaves saying:

"If you are worried about gas mileage....."

Of course mama made up this story just to make a point.. Which I got then and never forgot....

Even though I am sure there are many types of concerns that might make one worry about gas mileage, however every one of those "concerns" should have been applied when purchasing the X5 in the first place......

Oh yeah, I use 93 all the time.