I had a smart car for a little over a year. My typical combined mileage was around 40mpg. My high for a tank was 46 in the summer on mostly flat highway. I didn't try any but the mildest of hypermiling techniques because I didn't want to confuse the servo-transimission (not accellerating to a stop sign). I think the smart with some aero mods could be a great MPG car. The thing isn't exactly aerodynamic.
I liked the car, but the family grew, so I traded it on a new Jetta sportwagen TDI.
Now, I commute in a 2007 corolla and am getting around 40 mpg with a few more hypermiling techniques. no mods yet.
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