Notes:

^aCompressed natural gas (CNG) and liquefied natural gas (LNG). ^bFlex fuel/ethanol vehicles are capable of running on E85, unblended gasoline, or any ethanol-gasoline blends in between. ^cExcludes gasoline-electric and diesel-electric hybrids.

Includes the total number of heavy duty vehicles (Ex. school buses, transit buses, intercity buses, and other trucks) that were manufactured or converted by vehicle suppliers (companies or organizations) in the associated calendar year.