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

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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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SOURCE: https://www.energy.gov/eere/vehicles/articles/fotw-1101-september-30-2019-mediumheavy-trucks-were-4-vehicle-population