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Why YSK: People seem to, on average, think that a car takes a lot of fuel to start up. In reality, it takes on the order of a few millilitres of fuel to start an engine. That means if your car isn't equipped with an automatic start/stop system to stop your engine instead of idling, it saves fuel to turn off your engine and start it back up when you need it.

Caveat: air conditioning and radio might not work with the engine turned off.

Scenarios where this might be useful include waiting for trains to pass at rail crossings, waiting for food at drive-throughs, dropping off or picking people up on the side of the road when they need to load stuff, etc. May not be a good idea to use this while waiting at a red light because starting the engine does take time which would annoy drivers behind you when the light turns green.

Some cars are equipped with systems that will automatically stop the engine when you are idling for a while (e.g. waiting for a red light). If yours is, then manually turning off your engine will probably result in reduced fuel savings compared to just relying on the car to do it for you.

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[-] Spyd3r@lemmy.world 46 points 1 year ago

Starting and stopping a car is the worst thing you can do to it, doing it repeatedly on purpose is just asking for expensive problems, like a burnt out starter, missing or worn teeth off the flywheel, broken stater mount on the block, dead batteries, coked up and worn out turbo bearings, bearing and knock issues due to lack of lubrication, soot buildup in diesel engines, failed emissions systems, etc.

The few pennies you save in fuel is not worth it, upping the time to 5 minutes would make more sense.

[-] Spacebar@lemmy.world 10 points 1 year ago

Makes sense. The biggest takeaway from this post is that long idling is wasteful. If your vehicle isn't designed with auto start / stop, then don't turn it off and on in traffic. If you are waiting in a driveway for someone to come out, then turn it off.

[-] infogic@lemmy.world 10 points 1 year ago

In some cities in my country (maybe all) it is regulated and fined to idle your car over 1 min, the point of it I think is to make people used to turning off their cars for train crossings and bridge openings.

[-] StrayPizza@lemmy.world 1 points 1 year ago

How does that work with stop lights? I'd say most stop lights are longer than 1 minute, so does everybody turn their car off while waiting? Does that cause a noticeable delay when the light changes?

this post was submitted on 14 Jun 2023
440 points (90.0% liked)

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