Are you wondering how replacing a percentage of your fleet with hybrids would affect your bottom line, or your region’s air quality? The HEV Fleet Cost and Benefit Calculator Tool will allow you to compare the lifetime costs and emissions of a fleet of hybrids versus a fleet of conventional vehicles.In the first menu, you will choose up to five hybrid vehicles and the comparison conventional fleet vehicles they will replace. If you would like to select a different fleet vehicle, click here or on the enter your own link below. Emissions data are available for the list of default 2008 model year fleet vehicles. In all cases, you can override the default cost values, which are projections from national fleet data, with your own localized information.