This is a really great car. I have had no mechanical problems with it at all. On the highway (55 mph) my LX (not hybrid) gets 47 mpg! It is about 30 mpg around town. The only two problems I've had? The car is VERY noisy driving down the road. In the job I just left, I would drive three 1-hr roundtrips and two 4-hr roundtrips. It killed my back. My legs would be nearly numb when I got to work.
Gas Mileage. Very roomy in all the seats and the trunk.
Put sound dampening pads/carpeting in the doors and trunk lid. Spray the bottom of the car with sound-dampener. Come up with softer and more supportive (where support is needed) seat designs.