Source: BTS. Motor vehicles, fuel consumption and travel data include light duty vehicles, buses, trucks and motorcycles.
Total Motor Vehicle Fuel Consumption and Travel in the United States, 1960-2014
The Oil Shocks of the 1970s and early 1980s were accompanied by an increase in the fuel efficiency of motor vehicles. While in 1970, a motor vehicle was consuming on average 800 gallons a year (about 12.5 miles per gallon), in 2014 this figure dropped to 660 gallons a year (about 22 miles a gallon). The system-wide improvement in energy efficiency was consequently around 40%. However, the 1990s saw an increase in the average amount of fuel consumed per vehicle as commuting distances and congestion increased, especially in urban areas.