The current gen prius is a midsize car according to the EPA and therefore in the same class with the Accord and Camry. I'm 6'2" and i fit perfectly comfortably both in the front and rear seats.
http://www.fueleconomy.gov/feg/compx...Field=Findacar
The front seat cabin space is much larger than a toyota tacoma for example in every dimension.
The Volt's 40 mile full electric range is enough for 90% of the population 90% of the time. That means if you drive 40 miles or less per day, you never have to get gas and your fuel cost is 1-2 cents per mile depending on your local utility price. The rest of the time its a gas electric hybrid. Works for me and a lot of other people.
An electric motor is far more reliable than any internal combustion engine. It only has 1 moving part and 2 lubrication points. Hybrids have been on the road for almost 10 years now and I've never heard of one going bad. Please correct me if I'm wrong. Electric motors in pumps, elevators, machine tools etc, have been known to work day in and day out for 100 years.