Spent the day driving around on all EV... no radio, AC, etc. Nothing! I drove about 50 miles, and about 35 miles into it, I stopped at Target for awhile to juice up a bit more. However, once I pulled into my driveway, I plugged in and about 5 minutes later, the engine turned on. It was a hot day (probably mid-90s), but I thought the engine only turned on during really cold days.