Originally Posted by Napalm

wonder if it's not connected to an actual battery constant line.

or as mentioned too sensitive to voltage drop. My escort doesn't seem to mind it at all and I have it set to show battery voltage (one of the display options) and it will dip to around 12.2 sitting at a light. Hasn't gone below that yet but it also doesn't stay off that long right now being summer.



I think you read my post wrong - or backwards.

I argued that starting a modern car today doesn't take the fuel gulp that cars of yore used to need. so that myth that just stating a car takes more fuel that letting it run for a while is not true today.



your fuel gage was probably also busted.

but some simple numbers for the crowd

3.5L ecoboost mill - stock tune - at idle with normal load (radio on, AC, no lights) will require .54 gallons / hour to run. at idle.

2.7L ecoboost mill - stock tune - etc - .51 gallons per hour

GM 6.2L V8 (LS3 or Truck cam) - stock tune - at idle with normal load (radio on, AC, no lights) .65-.71 gallons per hour to run.

* values approximate.

I'd have to look up others but I promise you this your 94 s10 was most likely within either of these values if not higher.

So 8 hours - half a gallon per hour - would need 4 gallons - which should easily show up on a gage.

Also as pointing out - I don't know where you drive but I do know in my commute especially going home - when school is in session - there are 2 places where I might sit at a stop light 5-7 minutes. In 10 days worth, that's nearly a hour. And that's just one light.

So yes it can - for some driving paths - save a good bit.

Originally Posted by LoneWolfTrucker

Several years ago when i was still a bachelor, I started my 94 S-10 Blazer and locked it running out in front of my apartment to warm up. I then went into the apartment, and completely forgot (got a phone call, then got busy doing some things around the apartment). About 8 hours later I remembered. I had just over 3/4 of a tank of gas when I started it, and when I ran out to move it back to my spot and turn it off, after 8 hours, it was at 3/4 of tank. 8 hours idling used roughly 1/16th of a tank of gas.

The point, idle time doesn't burn much fuel. The start-stop technology is for emissions AND for long-term fuel savings. (Think 1/16th of tank of gas per vehicle per month over the course of several months.)

Personally, as one that isn't very environmentally minded, I hate it. My 16 3.5EB doesn't have it. Which is why I am no hurry to upgrade even though I think the 18 Sports are sweet.

Originally Posted by JAMADOR

^ On point #1, auto s/s wouldn't have engaged, as it is disabled if the driver's seat belt is not buckled (assuming you were out of the truck talking to the officer).
And, over the course of a half hour, the engine likely would have started due to vehicle charging or heating/cooling.

Originally Posted by stormsearch

Newer vehicles have a much higher electrical demand (electrical fans being one of them at 40+ amps) which will load an engine. Alternator efficiency for this vehicle is around 74% and most of our trucks have a 200A or larger alternator. Eliminating loads on the engine is one of the reasons why EPAS was added. I'm sure there are other factors but this is the significant one. If we want to quickly warm up a cold engine, turn on heated features to load the engine.

Originally Posted by jctevere

The engine is stopped at a specific "efficient" spot in the combustion cycle to allow for quickest restart and least stress possible on the starter

Originally Posted by vulnox

I love the S/S feature so far. It helps that we also have a 2016 C-Max Energi which when the primary battery is depleted runs in hybrid mode and does S/S.

The advantage of the C-Max, which I could see coming to non-Hybrid-Electric vehicles in the future is that the A/C and heat don't rely on the engine. Even in MI I notice how quickly the A/C starts to lose its cooling ability once the F-150 engine turns off.

The truck starts the engine before it gets too hot though, but that further reduces the efficiency of the feature. Moving the A/C compressor to electric drive like the C-Max would allow it to keep going regardless as long as there is battery power. But maybe that's the problem, drawing current for the A/C and having enough to restart the engine may require a bigger battery system.