Specifications include, but are not limited to: The City of San Antonio is requesting an evaluation of each light, medium and heavy duty asset within the City's replacement schedule of units to be replaced within the next five (5) fiscal years and determine if an economic and operational case can be made for the transition to a specific type of alternative fuel and identifying associated costs for recommendations made so that the City can use this analysis as a guide for future purchases. Technologies to Consider but not limited to: Current conventional fuels and all alternative fuels and technologies be identified in this study to include but not limited to: E-10, E-85, B-5, B-20, HLA, enhanced diesel technology, Hybrid-Electric, (diesel or gasoline) Electric, Natural Gas Fuels, (CNG, LNG) and Propane