Average 43mpg with A/C off, 40 MPG with A/C on. Almost triple my previous vehicle.
With a bad back it is very easy to get into and out of the car. Very roomy when compared to other vehicles in the same class, whether two or four passenger.
It is obvious that Mercedes put a lot of thought into the materials in the SmartCar. While it is at the lower end of costs for a new vehicle, the quality is excellent for the price.
Have driven on a number of 350 mile trips each way on the Interstae and found the ride comfortable. Around town it holds its own, except on very rough roads.