If I drive like a maniac I can get my smart down to 40mpg, 55-50mpg around town typical (with passenger) and 70mpg on the 50 mile each way run to work with just me in the car.
Date ..... mpg
10/10/08 59.0
06/09/08 54.6
03/09/08 71.8
02/09/08 72.1
26/08/08 58.8
20/08/08 61.7
18/10/08 66.6
14/08/08 68.8
11/08/08 70.7
07/08/08 65.2
01/08/08 67.4
29/07/08 65.4
28/07/08 47.7
Yes, I suppose I might be a little anal about it - I even calculate miles per £