I can't say anything about the Civic or the Prius, but I can say unequivocably that the Camry Hybrid is the most comfortable vehicle I've ever owned, leg-room wise. Both front and back. My commute has lots of long rolling hills, and slow-and-go traffic, and that seems to be the best thing, as long as the hills are working in a downhill trend. In other words, my commute to work is no great shakes, but my commute home is incredible, mileage-wise. I can coast for miles with the electric motor, and the "pulse-and-glide" technique.

My commute is about 17 miles each way.