GM Tests Process to Raise Fuel Economy

General Motors Corp. said it is testing a combustion process in concept cars that could raise fuel economy by 15% over current conventional engines, the Associated Press reported.
The process GM and other automakers are testing, called homogeneous charge compression ignition, approaches the fuel efficiency of a diesel engine without the need for advanced pollution controls, GM said in a statement.

 

Sounds interesting, got a link?

 

That was all they listed in the article. I will see what I can turn up.