Didn't find the article in a search but probably still know by quite a few here already:
More Here: http://www.siliconvalley.com/news/ci...nclick_check=1GM tests technology that could raise fuel economy by 15 percent
Article Launched: 08/24/2007 07:49:36 AM PDT
DETROIT - General Motors Corp. says it is testing a new combustion process that could increase fuel economy in conventional engines by up to 15 percent.
The announcement comes as fuel economy has become a increasingly important issue as gasoline prices have risen. Foreign automakers have captured a bigger share of the U.S. market in part by emphasizing fuel efficiency.
The process GM is testing, called homogeneous charge compression ignition, approaches the fuel efficiency of a diesel engine without the need for advanced pollution controls, the company said in a statement.
It is being tested in two drivable concept vehicles, a Saturn Aura and an Opel Vectra, and was to be shown to reporters Friday at GM's proving ground in Milford.