100% the cheapest, most green choice is keep driving what you already have. But when I did my own math on my projected ownership of 10+ years, going electric was a no brainer on deciding between ICE and electric, and I'm betting that math will only get more in favor for electric on the basis that manufacturing petroleum products is dependent on a limited resource while green electricity is only getting bigger and cheaper. Especially if you're able to get your own solar power generation.