I haven't done a real mpg test yet, I have about 200 miles on the car with 40% hi, 60% City. but the OBC says 16mpg combined. That's with fairly spirited driving, not very much WOT though. Since this is my first Z I'm not sure if that's good or bad. My mini cooper S JCW would get 26mpg combined and nearly 31mpg hi, and it was nearly as fast. 5.7 0-60. I'm going to miss that car, but i think I'm liking the Z better already