this post was submitted on 14 Jun 2023
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You Should Know

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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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[–] [email protected] 26 points 1 year ago* (last edited 1 year ago) (2 children)

Life Pro-tip: don't turn your car off unless you're safely parked. Not only is it insanely unsafe, but you're actively blocking traffic even if it's stopped around you; in the event of a wreck involving your car in said inert state, you're in legal trouble in a number of directions. Don't be a dumbass.

The infinitesimal amount of "saved" fuel is absolutely nothing compared to the mind-bogglingly enormous amount of commercial waste that pushes our civilization to the brink. You're not "doing your part" in any way at all with this bullshit. Stop already and think, FFS. πŸ€¦πŸΌβ€β™‚οΈ

[–] [email protected] 13 points 1 year ago

Many new cars have start/stop features builtin. If the computer controller detects that the engine may have trouble starting (low temperature, low battery, starter motor failure, whatever), it won't stop the engine for you.

Or that's the theory.

[–] [email protected] 7 points 1 year ago (1 children)

Chiming in to agree that the scenarios listed are mostly ridiculous to think about turning your car off. Knowing that ~7 seconds of idle time is a reasonable threshold for just turning off your car is certainly useful, but how many times has someone turned the ignition key and the car hasn't started due to battery drain or some other failure? Now imagine that happening at a stoplight, a drive-thru, or a rail crossing.

[–] [email protected] -3 points 1 year ago* (last edited 1 year ago) (1 children)

Seriously, this is some malinformed groupthink. How thafuq does anyone think that it's safe at any point to be a stationary object in the middle of the damn road?! Assuming your car starts right back up again without any issue (non-zero chance of a wide array of complications there), why would you choose to add several seconds to your reaction time in an unforeseen emergency where a fraction of a single second could be the difference between life or death β€” and not just your own?! Fuck. This very notion is so disgustingly self-absorbed and short-sighted. Christ on a stick.

[–] [email protected] 6 points 1 year ago (1 children)

Man, this sounds so american.

[–] [email protected] -2 points 1 year ago

Not very often one finds a low-effort burp of a comment in the wild here. Reddit is clearly leaking from its lower levels now. πŸ€—