[viking79]

As others say, just charge it fully unless you plan on storing it. The Volt is designed to last thousands of cycles (some already have on the order 2500 cycles with minimal loss). The Bolt EV maybe only needs up to 1000 cycles or so (which would be around 238000 miles). Point is, Bolt EV charges for max range, Volt for max cycles. I also think the Volt and other extended range EVs leave some space for when the engine is running to prevent overcharging.