It's the old and familiar Reliability Bathtub Curve...
When ICE vehicles wear out, they do not have catastrophic fire risk. Unless the fuel tank corrodes through and leaks, but I've honestly never heard of that happening. You DO get occasional fuel line leaks and high pressure fuel injector leaks, but those are rare.
Yep - I love that graph and use it when I teach.
Ironically, a debate I sometimes have with colleagues is that all the cheap crap we now import from Asia has changed the curve a bit and we see this with “energy” issues as well such as poorly made USB charging cubes or sketchy thin USB cables - same thing with extension cords and some of this corner cutting crap has worked its way into our home appliances like dishwashers or dryers, etc.
I am always skeptical of stuff made in China and have many experiences to back it up - not sure the Chinese products follow the bathtub if they cut corners.