![]() GM is also increasing its attention to what it calls "opportunity-type" controls. He added variable cam phasing, direct fuel injection, reducing engine accessory loading, electric power steering, improved vehicle aerodynamics, increased cooling airflow sealing, and reduced tire rolling resistance to the list. ![]() "Great examples of technologies that improve vehicle efficiency include added transmission gears (e.g., 6-speed versus 4-speed) lowering engine operation speed, enabling lower numerical axle ratios, and, in many cases, increasing performance and capability," Clark said.
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