> If I had a 10% loss in fuel economy, I’d be looking for something wrong and fixing it.

Have you never had a car start burning oil due to gasket failures and what not?

All of the cars I've owned had 80k plus miles on them when I bought them, and most recently I disposed of a 2001 Corolla with 265k miles on it. They all had various moving parts that failed at least annually and prevented me from using the vehicle *at all*. I'll take a slightly reduced range on my EV over that, any day.

I’ve had cars that burn/use oil. That doesn’t significantly change fuel economy though.