Shika the studies I have seen say it is better to burn natural gas, make electricity, charge a car, and drive.
Than to burn gas in a car and drive.
That was because the methane emissions from a huge number of mobile sources are actually quite problematic. As far as vehicle capability there are actually econometrics papers and consumer choice models etc... that give valuation to things such as towing capacity, cargo capacity, interior room, etc... I am not saying these evaluations are good, or believable, but it is a non-negligible factor when comparing vehicles. So for example losing the middle seat in the Volt is problematic. Just like losing a lot of the bed of the truck. A person still might buy the vehicle and then have to rent another vehicle to accomplish certain tasks. Or in the case of a middle seat they might buy the vehicle, then sell it to buy another one. That is still a cost to the consumer and not something they appreciate.