A method and system for determining comparative performance of an alternative fuel vehicle, such as an electric or hybrid vehicle, based on actual use of an existing gasoline or diesel fuel vehicle. The method includes obtaining trip data from an existing vehicle, determining performance metrics of the vehicle based on the trip data, determining simulated performance metrics of an alternative fuel vehicle based on the trip data, comparing the performance metrics of the existing vehicle and the simulated performance metrics of the alternative fuel vehicle, and presenting the comparison to the operator.