| Business

Larger text Larger text Smaller text Smaller text | Order Photo Reprints

Start-stop gaining momentum

Email Newsletters

Click here to sign up for one of our email newsletters.

On the Grid

From the shale fields to the cooling towers, Trib Total Media covers the energy industry in Western Pennsylvania and beyond. For the latest news and views on gas, coal, electricity and more, check out On the Grid today.

'American Coyotes' Series

Traveling by Jeep, boat and foot, Tribune-Review investigative reporter Carl Prine and photojournalist Justin Merriman covered nearly 2,000 miles over two months along the border with Mexico to report on coyotes — the human traffickers who bring illegal immigrants into the United States. Most are Americans working for money and/or drugs. This series reports how their operations have a major impact on life for residents and the environment along the border — and beyond.

By Brad Bergholdt
Friday, Oct. 25, 2013, 9:27 p.m.

Question: I've read a few stories about new cars that turn off the engine at stoplights and start again every time you go. How much gas will this save? Wouldn't it use more gas to start back up? Would this wear out the starter?

— Jan Mueller

Answer: Stop-start, also called start-stop, is a fuel-saving and CO2-reducing trick borrowed from hybrid vehicles. Already in wide usage in Europe and Japan, it's beginning to gain momentum in this country, with a half-dozen or more vehicles offering it.

In a nutshell, the engine turns off at stoplights and promptly restarts as you release your foot from the brake pedal. Fuel savings are claimed to be about 10 percent to 15 percent in city driving, which could vary depending on actual driving conditions. Stopping and restarting an engine uses less fuel than leaving it running.

The 2014 Chevrolet Malibu, the first domestic mid-size vehicle to offer stop-start as a standard feature, utilizes a beefed-up starter motor, a larger and more robust absorbed glass mat battery, and an auxiliary battery in the trunk to provide accessory power during “auto stop” sessions. The brain behind the system looks at your air-conditioning setting, cabin and outside temperatures, vehicle speed and brake pedal pressure to decide whether it's appropriate to shut down the engine.

I drove a rented Malibu for several days to check this out and came away with mixed feelings on how it's implemented on this vehicle. Without the benefit of an owner's manual, I discovered auto stop only functions if the A/C button is pressed twice, which allows Econ mode. Additionally, auto stop functioned only when I pressed the brake pedal rather firmly at a full stop, as one would if you planned to remain absolutely stopped, and intuitively stood down when I was creeping and stopping briefly in heavy traffic. The only sense a driver has of auto stop occurring is the tachometer's drop to zero.

All lights and accessories remain on with nary a hiccup. During long stop lights, I thought this was very cool, as I wasn't using any fuel or producing emissions. The instant I released the brake pedal, the engine would restart, before my foot could make it to the gas pedal.

My only beef was startups weren't as smooth as hybrids utilizing an integrated electric motor system. During a few starts, there was a bit of an annoying jerk and rumble. I didn't attempt to record fuel economy numbers, as my driving was a mix of city and highway and wouldn't have been a reliable measure.

The added cost of a typical stop-start system is around $200-$300, and AAA forecasts this is recoupable in about 2-3 years of driving. I'm a bit leery of a conventional brush-type motor, pinion/ring gear-driven starter system, as there are quite a few hard-working parts to wear, as well as a battery that's much more expensive than typical.

I think I'd like the Malibu's auto stop system as well as I did the rest of the car if there were an auto stop “off” button, as found on most other stop-start vehicles.

If we were paying European gas prices, that little restart rumble and down-the-road maintenance costs would be easier to accept.

Brad Bergholdt is an automotive technology instructor at Evergreen Valley College in San Jose, Calif. Email him at

Subscribe today! Click here for our subscription offers.



Show commenting policy

Most-Read Business Headlines

  1. Shell shovels $30M into proposed Beaver County plant site
  2. Bond funds hold onto cash
  3. Extended oil slump takes toll
  4. Tech Q&A: Why you should test your router
  5. Of Caitlyn Jenner and workplace restrooms
  6. Small business hangs on fate of Export-Import Bank
  7. Off-duty but on call: Suits seek overtime
  8. Muni bond funds stressed
  9. Companies hand out perks, benefits instead of pay raises
  10. When it comes to home ownership, Hispanics finding locked doors
  11. $2-per-gallon gas expected by year’s end, but not in Western Pa.