The upshot? Motorcycles were indeed more fuel-efficient than cars and emitted less of the greenhouse gas carbon dioxide, but they emitted far more smog-forming hydrocarbons and oxides of nitrogen, as well as the toxic air pollutant carbon monoxide. The devices determined the vehicles’ fuel economy and emissions profiles while the vehicles were running on the real-world course in California’s Alameda County earlier this year. None of the vehicles’ makes and models were disclosed.Īll of the vehicles were equipped with portable emissions-measuring systems that took exhaust gases from a probe in the tailpipe and engine information from the engine control unit. Hyneman trailed him at speed on each of the three bikes. Seventy-five percent was freeway driving the other 25 percent was in the city. Selecting three motorcycles and three cars that represented popular models from the ‘80s, ‘90s and ‘00s, they put the six vehicles through a 30-minute, 20-mile course.
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