On the freeway, with the cruise control on fairly flat highway, we could get around 45 mpg (avg. 65 miles/hour and total 2 persons in the car). My wife is the primary driver of this car with a 25 miles mix of half freeway and half local daily commute to work, and she managed to get 41 mpg. I learned from her that the trick is to be easy on the gas pedal and you want to try not to let the motor “assist” bar to come on, when possible. Always use cruise control when possible (above 40 miles/hour).
Good stereo system, Great gas mileage.
Reduce the whining sound from the electric motor. Also improve the acceleration (it is powerful enough to take total of 4 persons, but the acceleration is just slow, no matter if there is 1 person or 4 persons in the car).