EPA SmartWay data from 2018 shows Class 7, 8A, and 8B mileage-weighted miles per gallon data for each truck category for SmartWay program participants. Not surprisingly, Class 7 trucks had the highest urban drive cycle percentages, since many more of these types of trucks are involved with last-mile deliveries, which consist of more stops along the route. Normally, the mpg would be much lower with this type of driving, but the greatly reduced payloads also reduced the fuel consumption.
Miles per gallon of single-unit trucks (based on total travel and fuel consumption) increased by 2.7% from 7.3 mpg to 7.5 mpg from 2007 to 2018. Total fuel consumption declined slightly as single-unit trucks traveled 20.9% fewer miles per vehicle.