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This paper presents the findings of a study that compared the fuel efficiency, power, emissions, engine wear and material compatability characteristics of automotive four-stroke cycle engines fueled by E95 (95 % ethyl alcohol and 5% lead free regular gasoline) and 87 pump octane number lead-free gasoline. A group of six senior Automotive Engineering Technology students, conducted the research over a one-year period. Two Mankato State University faculty served as directors for the project. The laboratory facilities at Mankato State University were used for vehicle modification and testing. Two identically equipped 1994 Geo Metros with 1.0 liter, three cylinder, throttle body fuel injected engines were used for this study. After a 6440 km (4000 mile) break-in period, to assure the cars performance characteristics were equal, one of the vehicles was converted to run on E95.