Let's say you have a Tesla and a Toyota Tundra. How do you keep the gas useable in the Tundra except by driving it? I actually am in this situation partially, like a mini Jeff, my T100 was driven about 200 miles this year or less, having a plug in hybrid. The gas was already three years old when I worked on the cylinder head. It took me three years to do the head gasket. I was going to drain tank and all that, but then said what the heck and just started it. It started fine and passed smog with the three year old (more than that) gas. Now I added some fresh to the old. But I don't drive it, barely at all. It's a truck so it goes to pick up things a truck is needed for. So how does a real EV and gas car owner handle this. You want to be electric only, but have this gas vehicle that must be used too.