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This project demonstrates the use of M85 as an alternative fuel for vehicle operation. The fleets chosen for this demonstration experienced driving conditions typical for most vehicles, i.e., interstate highways and suburban traffic. Four generations of flexible fuel vehicles (FFVs), the 1986 and 1989 Ford Crown Victoria and the 1991 and 1993 Ford Taurus, were used in individual fleet operation. The demonstration spanned a period of over seven years from 1988 through 1995 and approximately 220 vehicle-years of M85 FFV operational data were collected. These data were analyzed to create a comprehensive knowledge base for fuel economy, emissions, driveability, acceleration, maintenance and wear characteristics of FFVs. A comparison of the overall performance of these vehicles with conventional gasoline vehicles was made. Important experience in the design, construction and maintenance of M85 refueling facilities was obtained over the duration of this project.