Advertising not completely forthcoming. Film at 11!! Seriously, though, anyone who takes marketing at face value is begging to be lied to. It’s no different than a credit card offering 0% interest, with the fine print showing that’s for 3 months, at which point it raises to 25% interest. Or a bottle of “fruit juice, made with real juice!” with the fine print saying “10% juice extract”. In this case, GM is simply marketing the aspects of the car that are most appealing. It’s not an outright lie, it’s just not a complete disclosure. They know people are mostly concerned with the price of gasoline, and are not thinking about the cost of electricity to power the car. Therefore, they only talk about the gasoline efficiency.