3 ms·

He can turn it off if he wants. I've saved considerably more time (maybe like 20-30 minutes?) in just a few months of having my new Subaru.

ultrarunner 3y ago
It resets itself back on (by law) every time you restart the vehicle. A couple days ago mine failed to restart itself, instead shifting into neutral (!) and rolling partially into the intersection I had intended to pull out into. It wouldn't shift into park because it wasn't "on" (?) but also wouldn't turn "on" (!?) as traffic started to barrel down on me. I'm honestly not sure what sequence of pushing the "on/acc/start/off" button, the "park" button, and "drive" button got it back running, but eventually I was able to go. It was a somewhat stressful experience, but I guess I saved ~10-15 seconds of idling trying to leave work?
- deleted 3y ago
  [deleted]
- giantg2 3y ago
  "It resets itself back on (by law) every time you restart the vehicle" That's what internet searches and fuse pullers are for. "but I guess I saved ~10-15 seconds of idling" That's where the calculations get tricky. There's usually a time limit for which it's less efficient to stop the engine (about 4-7 seconds). So to calculate fuel savings, you actually should only count idle fuel rate times the number of seconds above that cutoff, then you also have to account for less efficient stops under that rate (maybe just subtract them from your seconds above so you get a net seconds beyond breakeven mark). I'm not sure any the systems track it that way, it's just how much overall time the car spent in the stopped mode.
  - ultrarunner 3y ago
    I used to just turn my car on and off when I wanted it on and off. Now I have to do internet searches and figure out how to modify (break) some black box system to keep it from creating minor safety situations or inadvertently undervolting the stupid touch screen so my stereo no longer works (requiring a turn-it-off-and-back-on-again that I … you know, can no longer do).
Incipient 3y ago
Even 1h every few months. My car consumes about 1lt/hour idle, and at $2/lt for fuel, thats a saving of $2/few months. Or about $10/year. Stop-start just doesn't seem worth it. Hybrids where you can travel kilometres in stop-start traffic over the course of an hour every day without using the engine at all, now that seems super worthwhile!

ultrarunner 3y ago

It resets itself back on (by law) every time you restart the vehicle. A couple days ago mine failed to restart itself, instead shifting into neutral (!) and rolling partially into the intersection I had intended to pull out into. It wouldn't shift into park because it wasn't "on" (?) but also wouldn't turn "on" (!?) as traffic started to barrel down on me. I'm honestly not sure what sequence of pushing the "on/acc/start/off" button, the "park" button, and "drive" button got it back running, but eventually I was able to go. It was a somewhat stressful experience, but I guess I saved ~10-15 seconds of idling trying to leave work?

deleted 3y ago
[deleted]
giantg2 3y ago
"It resets itself back on (by law) every time you restart the vehicle" That's what internet searches and fuse pullers are for. "but I guess I saved ~10-15 seconds of idling" That's where the calculations get tricky. There's usually a time limit for which it's less efficient to stop the engine (about 4-7 seconds). So to calculate fuel savings, you actually should only count idle fuel rate times the number of seconds above that cutoff, then you also have to account for less efficient stops under that rate (maybe just subtract them from your seconds above so you get a net seconds beyond breakeven mark). I'm not sure any the systems track it that way, it's just how much overall time the car spent in the stopped mode.
- ultrarunner 3y ago
  I used to just turn my car on and off when I wanted it on and off. Now I have to do internet searches and figure out how to modify (break) some black box system to keep it from creating minor safety situations or inadvertently undervolting the stupid touch screen so my stereo no longer works (requiring a turn-it-off-and-back-on-again that I … you know, can no longer do).

Incipient 3y ago

Even 1h every few months. My car consumes about 1lt/hour idle, and at $2/lt for fuel, thats a saving of $2/few months. Or about $10/year. Stop-start just doesn't seem worth it. Hybrids where you can travel kilometres in stop-start traffic over the course of an hour every day without using the engine at all, now that seems super worthwhile!