I doubt it. After a certain point (say 20 kWh), it is no longer beneficial to add an ICE generator backup. You are basically "all in" at that point. The Bolt EV's battery weighs close to what you would expect the typical ICE system to weigh, so you could basically get 80 kWh of capacity for the same weight and space as a 20 kWh + ICE generator system. At that point, you'd have close to 300 miles of range with the ability to recharge about 250 miles in less than an hour.