Comparison of Modern CNG, Diesel and Diesel Hybrid-Electric Transit Buses: Efficiency & Environmental Performance

Using fuel economy and emissions data collected by the Altoona Bus Research & Testing Center under the Federal Transit Administration’s new model bus testing program, this report compares the performance of modern diesel, hybrid diesel-electric, and compressed natural gas buses with respect to three issues at the forefront of current US policy: efficiency, air quality, and climate change.