44mpg in a 220d, that's optimistic if my experience with the 220d i have had today as a loan car is anything to go by. It's a 57 model with 3,000 miles and couldn't get more than 33 mpg over the 70 miles. My GS 300 averages around 35mpg and even up to 40, so petrol definately way to go (or at least a GS). PS Thought the IS250 i got the week before did better mileage than the diesel, but lacks power.