For the last 6 months I've been averaging 25-28 MPG during local driving (about 25 miles a day, 10 of those on the autobahn, the rest up and down hills). However, on two trips with mostly autobahn and some city driving I averaged@34MPG (430 miles to the tank and about 40 miles still left in the reserve when I filled up). Considering I'm carrying 4 people comfortably with luggage and can hit 60 in under 6 seconds, I'm pretty happy with my MPG.
Could have sworn I saw previous posts that 335is were getting almost the same as the 328i. Seems like those were not the norm.