[masraum]

Originally Posted by GH85Carrera

My wife's 2017 Macan has that. The first time I drove her car I went around the block, came to a stop and I started cussing the POS that can't idle and just died. Then I let off the brakes and it started up and off I went. It is fairly easy to program the key to turn that off as default. So it no longer dies at stops. I presume in a mild climate, and doing a LOT of stop and go driving it might save a little fuel and pollution. For our driving, it is just annoying, and turned off.

You're wrong, unless you only stop at stop signs and never have to wait for someone else to go first, so your stop is super short.

I'll summarize the video below.
1 start-stop systems depending upon the traffic can increase fuel economy anywhere from 4-9% over the same vehicle without it.
2 The starters for cars with a start-stop system are different and designed to be more robust to start and stop the vehicle many, many more times, more frequently than the starters that the rest of us are used to.
3 In a very particular study (1.5L 4cyl) starting the car takes as much gas as it takes to let the car idle for ~7 seconds. Since pretty much any stoplight that we have to stop at is longer than 7 secs, it'll help.