My friends don't believe me when I tell them that I achieved over 30 mpg in my 528i on a recent trip to Florida and back to Michigan. It's AWD so I know there's a slight penalty for additional moving parts. And I also had to occasionally resort to pumping midgrade fuel into it in some remote areas when it was thirsty and I was desperate (midgrade but NEVER regular!). It seemed to make no difference in either performance or mileage. At one point at sustained speeds of about 75-80 mph the gauge showed the car was delivering 33+ mpg. I even snapped a photo with my iPhone for proof. I was astonished. That is well beyond what I expected to get in this fairly heavy car with an I-6 and auto trans. But no complaints. I love it!!
