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Increased concerns with fuel mileage in today's vehicles have focused attention on component efficiencies. Even though modern manual transmissions have high efficiencies, these efficiencies can vary widely from manufacturer to manufacturer. This paper, SAE 950892, addresses these variations and proposes a method for comparing transmissions based on duty cycles and gear usage breakdowns. Also, several approaches are given to address fuel mileage improvements for vehicles with manual transmissions.

For more information about efficiency guidelines capabilities at SwRI or how you can contract with SwRI, please contact Douglas Fussner at dfussner@swri.org or

(210) 522-3972.

| Design and Development | Engine, Emissions & Vehicle Research Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

September 30, 2008