The feature is found mostly on hybrids and electrics. It relies on the batteries to start the process.

This is demonstrably false. Even new Jeep Wranglers and Gladiators come with auto start/stop, and those are about as far removed from hybrids as it gets.

“Mostly” includes exceptions.

My point was that most vehicles include this feature, even those you’d least expect it on.

My 2022 CRV ICE has this by default. You can turn it off but on by default every time you start the car (US law or something.)

Again, mostly means majority and allows for exceptions.

This is false.

Can you find a link that shows that ICE / non hybrid and non ev make up the majority of cars with automatic start and stop?

There's many 100% ICE vehicles that shutdown at stops.

Mostly means the majority and by construction allows for exceptions.

The motor stops at TDC under compression and then fires the spark plugs to restart, reducing wear on the starter.

For others that -- like me -- have no clue what TDC is, I did a quick search[0]:

> Top dead center, sometimes referred to as TDC, is the point in which the piston in the number one cylinder position of your engine is at its highest point on the compression stroke.

[0] https://www.wikihow.com/Find-Your-Engine%27s-Top-Dead-Center...

Auto stop/start requires some (mostly minor) modifications to the engine, as well as updated software so that it is used only in “ideal” conditions. And the engine shutdown is done in a way that makes it quick and easy to restart.

I’m not sure, is it even possible to use these systems on diesel motors?

Of course - I've had a diesel Nissan Qashqai with a start stop system all the way back in 2013. Never had any issues with it.

This is an amusing place where most of the advancement was probably in the starter. The same thing that lets you have a small charger for your laptop has helped get a smaller starter that won't drain after a few starts. There is a lot of work that goes into starting an engine.