We turned in the Prius on Sunday after filling up the tank. I a week, we'd driven about 275 miles on half a tank, 165 miles of it high-speed freeway driving. When my DH figured out our mileage, he was surprised and pleased to find we'd gotten 45 mpg on the half tank. Not bad considering more than half of it was freeway driving.
In a comment Rhonda asked if a large man would fit in the Prius and I'd say yes. My DH is 6'1" with very long legs and he had no problems at all. In fact, the car is higher than our Acura TL, with excellent head room. Overall, it was surprisingly roomy inside. The hardest thing to get used to is the "snub nose" front as Rhonda put it in a comment. You can get the idea from this photo which I took out the front window while parked. The hood of the car is nowhere in sight!
Would I consider buying one? You bet. Gasoline prices may be down a bit, but I doubt we'll ever see $1.00 a gallon gas again anytime soon. But first we may have to rent a Toyota Camry and see if we like it better.