"Proterra was founded by Dale Hill in 2004 with a vision to design and manufacture world-leading, advanced technology heavy-duty vehicles powered solely by clean domestic fuels. After launching the first and most successful fleet of alternative fuel buses in the 1990s (the 16th Street Mall buses in Denver, CO, that are still running today), Hill formed Proterra to develop and deliver the “bus of tomorrow” to meet a need expressed by the Federal Transit Administration. With the launch of our fast charge EcoRide™ BE35 battery electric bus, Proterra has become the leading innovator of zero-emission commercial vehicle solutions. Proterra’s products help transit agencies deliver clean, quiet running, rider and neighborhood-friendly vehicles that also meet government regulations and local mandates. In fact, we are currently recognized by the California Air Resources Board as the first company that is currently delivering a full-size transit vehicle that meets California’s Zero Emission Bus Rules."
How about this for good data on fuel and emission savings?: