Kevin Bullis

A View from Kevin Bullis

GM's Advanced Combustion Saves Fuel

The automaker demonstrates long-awaited homogeneous-charge-compression ignition.

  • August 24, 2007

It’s getting harder to believe automakers when they say they can’t meet tougher fuel-economy standards. And it’s their own fault. Not only are they rolling out hybrid vehicles and developing advanced hybrids that can be plugged in: they’re also demonstrating, at least in concept cars, advanced combustion technology that could cut fuel consumption.

This week General Motors announced two drivable concept cars that use homogeneous-charge-compression ignition (HCCI), which provides fuel-economy advantages similar to those provided by diesel engines, but without the extra pollution. HCCI could reduce fuel consumption by 15 percent. The vehicles go up to 55 miles per hour on HCCI, shifting to conventional spark ignition for higher speeds.

Recently, MIT researchers demonstrated that such vehicles could run on ordinary gasoline, which could help the technology be quickly adopted.

Tech Obsessive?
Become an Insider to get the story behind the story — and before anyone else.
Subscribe today

Uh oh–you've read all five 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 and become an Insider.

  • Insider Premium {! insider.prices.premium !}*

    {! insider.display.menuOptionsLabel !}

    Our award winning magazine, unlimited access to our story archive, special discounts to MIT Technology Review Events, and exclusive content.

    See details+

    What's Included

    Bimonthly home 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.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

    First Look. Exclusive early access to stories.

    Insider Conversations. Join in and ask questions as our editors talk to innovators from around the world.

  • Insider Plus {! insider.prices.plus !}* Best Value

    {! insider.display.menuOptionsLabel !}

    Everything included in Insider Basic, plus ad-free web experience, select discounts to partner offerings and MIT Technology Review events

    See details+

    What's Included

    Bimonthly home 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.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

  • 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 home 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 of free articles this month.