Auto Stop/Start - 2013 Porsche 911 Carrera Cabriolet Long-Term Road Test

2013 Porsche 911 Carrera Cabriolet Long-Term Road Test

2013 Porsche 911 Carrera Cabriolet: Auto Stop/Start

January 29, 2013

2013 Porsche 911 Carrera Cabriolet

One of the first things I noticed when I got into our sleek, smells-so-new 911 is that it has an Auto Stop/Start function. And that it had been turned off.

I totally understand why. A couple of months ago, I was shuttling a short-term 2013 Porsche 911 from the photo studio to the office and had stopped to make a right turn when the car, apparently, died. I was sure I'd killed it somehow and would have some serious explaining to do to Oldham. Then I realized what was up. Not sudden death. Just Auto Stop/Start. Whew.

Carmakers are adding what they hope are unobtrusive technology bits like this to cars in an effort to wring better fuel economy out of conventional engines. An engine stop-start system can cut combined city-highway fuel consumption and greenhouse gas emissions by 3-10 percent. Add that to such things as regenerative braking, aerodynamics and other tricks that are often borrowed from hybrid cars and EVs and it can all add up to better mileage and fewer emissions.

Johnson Controls, which manufactures advanced batteries that are used in stop/start systems, estimates that up to 40 percent of all new cars and light trucks sold in the U.S. will have them by 2015, so it's a good idea to get used to them. Or hope you have the option of turning them off.

In our Porsche 911, it just takes a tap of a button to accomplish this. Auto Stop/Start also doesn't work when you're in Sport mode. Just one more reason to engage that baby at all times.

Carroll Lachnit, Features Editor @ 970 miles


  • jederino jederino Posts:

    I think its a smart feature to have, assuming that no additional wear happens as a result. The cost to replace worn systems on a 911 is worth lotsa fuel!

  • jpnpower jpnpower Posts:

    I hope that these systems become standard on all cars. Immagine the ammount of gas saved and pollution cut if traffic hell was a silent mass of stop/start. Also a hybrid or F1 style KERS system will greatly decrease gas consumption as well. One more reason that the average car should be a mild hybrid with stop/start and EV crawling ability. But it will be embarrasing if the stop starting actually killed the engine, and you were stuck in the middle of traffic with a dead engine.. ah...

  • jederino jederino Posts:

    Jpnpower, didn't the Malibu have a mild hybrid option that acheived very meager fuel economy gains? I also hope these can be improved and spread among the majority of cars.

  • jpnpower jpnpower Posts:

    JEDERINO, that was very poorly executed. Of course refinement is necessary.

Leave a Comment

Past Long-Term Road Tests

Have a question? We're here to help!
Chat online with us
Email us at
*Available daily 8AM-5PM Pacific
Call us at 855-782-4711
Text us at ED411