The average transit bus travels about 130 miles a day. An electric bus from the company Proterra can drive 146 miles, on one electric charge. Â As battery prices continue to fall and state mandates to cut pollution become more pressing, many cities around the U.S are starting to replace their fleets of gas-guzzling buses with electric and hybrid buses. In fact, electric buses are expected to account for 5 percent of new purchases this year. Â What makes an electric bus even more appealing is that it can save transit companies around $250,000 to $300,000 over the 12-year life of a bus. With electric buses, city streets will be cleaner and quieter.