I just bought a CPO 2007 X3 3.0si and with a very light foot, I am at 16 mpg around town and 20 mpg combined. I thought I'd do a lot better - just traded in my 03 525i 5sp and I averaged 24.5. I realize this is a completely different vehicle but I drove my 5 series harder. What are you guys seeing for gas mileage? Also just got a nail in tire the day after I picked it up. I don't want to pay for a new tire - standard OEM RF Dunlop SP Sport 01. I don't understand why they would put a summer tires on these - can they work through the winter or do I need to buy some all seasons?