the motorcycle used 28% less fuel than the comparable decade car and emitted 30% fewer carbon dioxide emissions, but it emitted 416% more hydrocarbons, 3,220% more oxides of nitrogen and 8,065% more carbon monoxide.
So yeah. Not exactly great. And btw our option on those hydrocarbons have changed a LOT in the last 13 years when this was published. See the decline of diesels post dieselgate.
CO2 is only a small part of the story
https://www.latimes.com/archives/blogs/greenspace/story/2011-09-28/mythbusters-asks-are-motorcycles-greener-than-cars
So yeah. Not exactly great. And btw our option on those hydrocarbons have changed a LOT in the last 13 years when this was published. See the decline of diesels post dieselgate.