Quicker Decelertaion

[Yaris Hilton]

Originally Posted by MUSKOKA800

I noticed this back in the day when emission controlled vehicles became the normal and was told that a slower/controlled RPM drop reduced pollution. My guess is that todays cars rev down slowly for the same reason.

Exactly. They used to do it with mechanical dashpots on a carburetor. Now it's the ECU slowly closing the throttle.