Now two vehicles in this plug-in hybrid segment have distinguished themselves in the fleet world - the Chevrolet Volt and the Toyota Prius, with this "green" technology resulted in low fuel costs for both vehicles. But when the results were analyzed, the Toyota Prius Hybrid Plug-in earned top honors with ownership costs that were lower than the Volt due to its low insurance and depreciation costs.  With lowest lifecycle costs in all high mileage scenarios and over short to long-term lifecycle terms, the Prius Plug-in wins its first Vincentric Best Fleet Value in America award for 2012.