In the United States, nearly one quarter of national greenhouse gas emissions come from the 280 million vehicles that drive on the nations roads each year. And while fleet vehicles – including the ~5 million buses, garbage trucks, law enforcement vehicles and more that make up public fleets, and the ~6.5 million rental cars, taxis, delivery trucks, long-haul trucks, and more that make up commercial fleets – represent only a small fraction of those vehicles, they are an excellent target for ea...