GM does make some hybrid versions of their large SUVs and trucks, but the diesel versions get much better fuel milage.
Why does a Chevy Volt have a price tag of $41,000? Even if the government offers an incentive, all that does is prop up GM. Is the cost really that high? Until that comes down, America will be driving on gasoline, especially since they have to buy another battery pack several years after they purchase new.
Again, vehicles being pitched as "green" are not always green. Those battery packs don't just instantly disappear when they die.
Scooterbug44 may be on to something with the solar on the car. If they painted the entire car with some kind of solar absorbing paint, it could charge the cars in the daytime, while people are at work.