WHITE PLAINS, NY – Engines employing homogeneous charge compression ignition may not yet be ready for prime time, but General Motors Corp. demonstrates during initial tests on public roads it’s making huge strides with its version of the futuristic technology. HCCI marries the best features of gasoline and diesel engines while providing up to 15% greater fuel economy than conventional spark-ignited powertrains, says Matthias Alt, manager of GM Powertrain’s HCCI program, noting GM’s test ...

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