This is my second Prius. I had the smaller 2002 model and traded up to the mid-size. On a 3,000 mile trip last summer from Harrodsburg, KY to Tazewell, VA, Geneva, IL, Fond du Lac and Spooner, WI, Story City and Amana, IA and back to KY we averaged 51 mpg. My wife is finally getting used to the quietness. It's fun to drive and has great cargo capacity. Yes, I'm a happy senior citizen. 84 this year.
Clearness of dashboard signals, pickup above expectations, quietness, and as prices rise to $3.00, the great mileage.
Smoother shock absorbers. Some way to keep mpg up in colder weather. I'm getting about 44 mpg hiway and 39 city.