this post was submitted on 25 Nov 2023
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Got some studies for that? Cause everything I've seen suggested that FAS, forced auto-stop, does help.
It only helps when people leave it on.
It's a small sample size, but literally everyone I know that owns a car with that feature turns it off immediately after starting the car every time they get in it.
It adds wear and tear to a car. The hot engine no longer has coolant running through it, hot oil drains off, etc. This is especially bad for turbos. So now the engine wears out sooner, which means the car is replaced sooner. Pulling a car out of service adds a huge amount of production resources, energy, and waste to an individual's footprint.
There are also calculations that can be done to determine how much fuel is saved. More fuel is burned at startup. You have to be stopped and off for a minimum period of time to reduce fuel consumption. That time is heavily dependent on many factors. But it's been found that generally you're not saving fuel unless you're at a light just as it turns red.
The wear and tear is the biggest issue. The worst thing you can do to an otherwise normal working engine is take it from 0 to 5000+ rpm in such short time.