Kevin Bullis

A View from Kevin Bullis

'Shape Changing' Flaps Improve Cruze Fuel Economy

Flaps open and close to improve aerodynamics or air cooling as needed.

  • August 11, 2010

Sometimes it doesn’t take much to improve fuel economy. As part of the run-up to the launch of its Chevy Cruze in the United States, GM is highlighting some of its features. One is a piece of pretty unimpressive technology. It’s not an advanced battery chemistries or radical engine design, just a set of shutters that open and close depending on temperature and vehicle speed. (GM is calling this “shape changing” although the changes happen behind a grill and can’t be seen easily.) At high speeds, the flaps close to reduce drag. At low speeds or high temperatures, they open to improve cooling of the engine. But, although the tech isn’t impressive, the result is significant–an added half mile per gallon.

The flaps couldn’t have cost much to add, and they probably could have been included with GM cars years or decades ago. No doubt, provided the right motivation, GM could incorporate other simple measures across its fleet that could improve fuel economy.

Uh oh–you've read all of your free articles for this month.

Insider Premium
$179.95/yr US PRICE

More from Sustainable Energy

Can we sustainably provide food, water, and energy to a growing population during a climate crisis?

Want more award-winning journalism? Subscribe to Insider Basic.
  • Insider Basic {! insider.prices.basic !}*

    {! insider.display.menuOptionsLabel !}

    Six issues of our award winning magazine and daily delivery of The Download, our newsletter of what’s important in technology and innovation.

    See details+

    What's Included

    Bimonthly magazine delivery and unlimited 24/7 access to MIT Technology Review’s website

    The Download: our daily newsletter of what's important in technology and innovation

/
You've read all of your free articles this month. This is your last free article this month. You've read of free articles this month. or  for unlimited online access.