 I just purchase my first BMW (2007 550i) I test drove the 528 and did not like the lack of power. The 550i is a BEAST and is a dream to drive, I can't stay home, I take the longest way home and the acceleration is orgasmic. I will never drive another car other than a BMW. Worth every penny. Not sure what my gas mileage will be yet, but so far not bad for a V8 engine. 