I think GB is saying,
“SUV sales are dropping through the floor and we want to loose less than 7 billion this year”
The volt does look cool.
http://www.gm-volt.com/image-gallery/
The type of fuel is not the problem, most anything will burn. Its the efficiency of the power system that has to be looked at.
A electric power train with a generator system is just way more efficient. A generator system made to run in a small RPM range can be made a lot more efficient than a normal engine that has to make power over a large RPM range.
For in city driving, having regenerative breaking will make heavy autos get almost the same millage as light cars so we can still be safe. Yes we can have 4,000 lb SUV’s that will still pull like trains, the original hybrid.
I see large SUV’s getting around 50MPG with a all electric drive train and a natural gas generator or any type of fuel system.
GB=GM