Medium/Heavy Trucks Were 4% of the US Vehicle Population in 2017 but Accounted for 26% of Fuel Use

Trucks in the medium/heavy truck category include tractor trailers, also known as combination trucks, and single-unit trucks.  In the most recent year for which data are available, combination trucks made up only 1% of the truck population but were responsible for 6% of all vehicle miles traveled (VMT) and 17% of vehicle fuel use.

Single-unit trucks were 3% of the truck population and 3% of VMT, while making up 9% of vehicle fuel use.

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