TRC's research team did analysis to determine whether compressed natural gas (CNG) or hybrid-electric bus (HEB) technology is more economically and environmentally efficient. The researchers developed a comprehensive bus life cycle cost model (LCCM) to evaluate HEB performance, taking into account both purchase price and operating costs. In the LCCM, 5 different bus technologies were tested in New York, NY; Seattle, WA; Long Beach, CA; and Washington, D.C. The technologies co