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This paper reports on a continuing Ohio Department of Transportation (ODOT) two year evaluation of a biodiesel blend, B20, (an 80/20 blend of diesel fuel and methyl soyate) in fleet operations. The evaluation is being conducted in two adjacent counties in northwest Ohio. The Fulton county ODOT garage has been operating all diesel powered equipment on B20 since March of 1996 and has been comparing operating results with counterpart equipment in nearby Williams county which has continued operations on diesel fuel. The results of this test are being monitored by Battelle which is collecting and analyzing detailed operational and reliability data on five (5) Navistar-International dump truck / snow plows in each county. Chassis dynamometer evaluation of engine power changes, “before/after” snap-idle smoke tests, identification of cold weather issues, and the consistency of on-site fuel blending have been conducted and are discussed in this paper.