~7 seconds before idling wastes fuel?

[Ratbert]

Yeah, I know that our aux batteries are feces. And yeah, I disable my auto start/stop with a Tazer. But hell, it looks like it could actually save quite a bit of fuel in stop & go traffic.

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[AcesandEights]

My g/f car keeps track of how much time it was in auto-stop, and what that translates relative to her average mpg. It's not staggering, but it does make a difference. If nothing else, it's interesting, anecdotally.

 

[Timmyjoe]

I've got a start/stop disablizer but I still shut the engine off if I can see I'll be sitting more than 15 seconds at a stop light or train crossing, or drive thru fast food window.

Best,
-Tim

 

[zakaron]

The goal wasn't meant to save the individual owner much, it was set up as an entire fleet savings and emission reduction. I normally turn this off, but will turn it on if I know I'll be at a long light or stopped for considerable time.

 

[wibornz]

There is a forum member that did a year long study about this issue. He recorded every tank full of fuel and the mileage that he got with the jeep including driving conditions, weather and some other data points. I don't remember everything that he tracked He did this using the auto start stop full time, and then the other six months not using auto start stop. He also did not use the couple best and worst tanks of fuel in both situations to get a more consistent normal for each setting.

He found that it Auto start stop saved him 12 gallon of fuel. That is about $36 dollars over 6 months in my area. Hardly worth the extra wear and tear on the vehicle turning off and on thousands of extra times.

 

[John VonJeep]

Hardly worth the extra wear and tear on the vehicle turning off and on thousands of extra times.

 

[Overkill]

I don't remember everything that he tracked He did this using the auto start stop full time, and then the other six months not using auto start stop.

The only thing that I saw with the 2.0 BSG that I never shut off ESS on (because it was smoother and quicker response than the normal starter ESS that was on our 3.6 we had) it's that in the winter months the fuel mileage would drop off due to winter blend fuels and also because the wind is worse on the brick aerodynamics (my guesses). I would get around 25.5 MPG in the summer and around 20.5 in the winter. So it would be interesting to know what variances there might have been in the test months, which test phase was which and if the driving was over the same amount of miles and the same roads.

I liked the BSG so much that I wish the 392 I have now had it on it, but I guess that needs to be posted in the thread for unpopular opinions...

 

[cornercanyon]

According to the EPA a 'typical' 2021 Jeep Wrangler 4dr with the 3.6l v6 running regular gasoline, experiencing the fuel savings of @wibornz forum member's study, would reduce tailpipe CO2 emissions by about 600# a year. It is not about one vehicle, it is about millions of them.

Now, we live outside a small rural town and rarely see the kind of traffic start/stop would have an impact upon. So, the embodied CO2 in the extra parts may not even be offset over the years of service. Finding the cost benefit balance is difficult in the US.

More likely we could have a greater impact on CO2 emissions if we relaxed on private vehicle's emissions and banned them from large downtown metropolitan areas requiring walking, bike taxis, and electric busses and delivery vans; and added attractive mass transit from suburban areas to the downtown fringes, (most likely by making the downtown fringe parking very expensive and inconvenient). This all would also be much more logical than high-speed trains across our wide open spaces.

Rural folks may enjoy having less of the government bothering them; Urban folks may appreciate effective transit; Suburbanites would adjust—

 

[Old Jeeper]

Yeah, I know that our aux batteries are feces. And yeah, I disable my auto start/stop with a Tazer. But hell, it looks like it could actually save quite a bit of fuel in stop & go traffic.

It's worth it in heavy traffic if you spend an hour driving to work twice a day in stoplights every ¼ mi or so.

 

[Dusty Dude]

All this hype over CO2 emissions is ridiculous. It is 7th on the list of things that affect the temperature of the earth. #1 is sun, and #2 is clouds. It is however, the first thing on the list that humans have an impact, and it is so minuscule as to be insignificant.

It is plant food. Anything that we do produce feeds the plants. More plants grow as a result, naturally recapturing the CO2 that we released from a previous natural captured state. The cycle continues…

 

[BobW]

I save gas in stop&go traffic by driving my used Ford dinkycar instead, letting the jeep nap in the garage ?

 

[Dp227]

On the non-etorque engine though, does start stop actually work for most of you?

when my JL was new, it worked constantly and the only reason it didn’t drive me crazy was by the time I had pushed the clutch in, the engine had started.

Now 2.5 years later, it never kicks on except for the first 72 hours after a several hour long drive. I guess the battery doesn’t get enough charge to need to use start/stop. I don’t get a stop stop error, fault, etc.

JL runs fine and I don’t worry about the Start Stop annoyance or shutting it off with the button or a Tazer.

 

[Heimkehr]

On the non-etorque engine though, does start stop actually work for most of you?

I've had my Jeep for just over 3 years now. 2.0T; non-Etorque. ESS was disabled via a plug-in harness during the first week of ownership. I will occasionally turn the function back on, usually on the return leg when running errands, to determine if it still works. It does.

While I've no love for ESS, I do as a matter of principle want everything on my vehicle to work, and work correctly. Thus my periodic testing.

 

[Old Dogger]

If I was concerned about fuel (gas) consumption, then I would not own a Wrangler!

 

[BobW]

Tho I never paid much attention to ESS, two years ago I noticed that it never activated. Still under warranty, I took it to local CJDR dealer. They replaced the battery sensor [68289207AC] twice without solving the problem. On third try they replaced the MAIN battery [BBH6A001AA]. Works since then. Somehow not confidence inspiring.

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