If gas is a concern then do not even think about the X5M. I can get 20MPG on long distance highway runs at 75-80. But I average 14-16 and drive it hard most of the time. If your not going to use the power then get a more economical model. Otherwise gas and tires will be a regular expense.

In fact today was hanging with a guy in an Audi S5 who thought he could loose me, but he had no chance. Went the fastest I have ever driven a car in my life today and the X5M was solid as a rock. Think I might have been getting 8-9MPG at the time......Steve