The engine auto on-off feature.

I once was driving in the beautiful twisty two-lane hills of southern France in an Opal manual rental.

I tend to leave it in neutral when going downhill.
It saves gas. Negates other factors on steering. No valve guide oil bypass leakage.

I found out the hard way that coasting out-of-gear kills the engine.
And power steering.
And power brakes.

Not a good situation..
Especially when a bus suddenly rounds the next mountainside corner and pulls across both lanes on the turn, and you are already at downhill speed with full load of passengers.

Good to know. Another claimed it was buried so deep in the OS that it couldn't really be diabled.

FWIW, I get in and 7/10 of a mile and one stop light later I'm on open freeway all the way to work (30 miles against traffic). I get that it might help mpg in stop and go driving, but the additional wear and tear just doesn't seem worth it.

supposedly the starters are designed to handle this on/off. i don’t know if true but i won’t use it. i refuse to sit stopped with engine off.