How does this help you at all when buying used? The number of 15 year old cars with maintenance records at all is abysmally small. And usually it’s an enthusiast car that’s not gonna be reliable anyway. Being on top of tire pressure and oil changes is definitely not nearly enough to keep a car maintained for 15 years. It really sounds like you’re not familiar enough with cars and just have a contrived idealistic view of the car market.

And how can you assure it’s well maintained?

I think it’s more often an involuntary manslaughter charge due to the gross negligence of allowing a child access to a gun. But sometimes it can be counted as murder even if it was unintentional if you were doing something so reckless and stupid you should have realized it would likely result in someone’s death. There’s an argument to be made that keeping a gun somewhere a child could access it would count.

I think the real short term answer is a plug in hybrid LiFePo4 where the ICE is basically just a range extender.