Which vehicles are the most fuel inefficient? Fill up your tank (or recharge your environmentally friendly batteries) and test your knowledge with this quiz.
In 1978 Congress established "gas guzzler" tax provisions in the Energy Tax Act to discourage production of automobiles with low fuel efficiency.
The measurement of fuel economy in the U.S. is miles per gallon (mpg).
The EPA is tasked with monitoring automobile fuel economy and conducts testing at a facility in Ann Arbor, Michigan.
The combined rating that U.S. automobiles must exceed to avoid the "gas guzzler" tax is 22.5 miles per gallon The combined miles per gallon value is a weighted average of city and highway miles per gallon.
The 1970 Dodge Charger featured in the "Fast and Furious" movie series had a combined rating of just 10 miles per gallon.
The "gas guzzler" tax only applies to passenger cars because trucks, minivans and SUVs were not yet a common mode of transportation in 1978.
The gas mileage of an M1 Abrams tank is 0.6 mile per gallon (.3 kilometer per liter). The M1 Abrams uses approximately 300 gallons every eight hours and takes 10 minutes to refuel.
The 1980 Maserati Quattroporte has an 8.8 miles per gallon rating. The Maserati had the distinction of getting the worst mileage on the Environmental Protection Agency's 1980 list of gas guzzlers.
The 1964 Pontiac GTO, often credited as the forerunner of modern muscle cars, had an average gas mileage of 12 miles per gallon.
Automakers measure the fuel economy of the vehicles they manufacture and report the findings to the EPA. The EPA audits 10 to 15 percent of these reports, which results in testing between 200 and 250 vehicles a year.
The 2015 Audi R8 had the lowest gas mileage in the two-seater class, coming in at 16 miles per gallon.
The Chevrolet Express has a gas mileage of 12 miles per gallon. Competitors, such as the Nissan NV200 and the Ford Transit Connect, nearly double the 12 miles per gallon of the Chevy Express.
The estimated annual fuel cost for the Lamborghini Aventador is more than $4,500.
The 1970 Chevrolet Chevelle SS averaged 12 miles per gallon.
The range of fuel consumption for semitrailers is 4 to 8 miles per gallon. There are an estimated 1.9 million semi trucks on U.S. roadways.
The Rolls-Royce Corniche IV was near the bottom of the 1995 list, with a fuel economy of 14 miles per gallon.
Gas mileage improves by up to 3.3 percent when tires are properly inflated. This gas mileage improvement means an equivalent gas savings of up to five cents per gallon.
The 2014 Nissan Armada 4WD has a combined gas mileage of 14 miles per gallon. According to Motor Trend magazine, the Nissan Armada 4WD is one of the least fuel efficient SUVs on the market.
The U.S. military is the largest institutional consumer of fuel in the entire world. The U.S. armed forces uses more than 100 million barrels of oil per year.
The Toyota Tundra earned the bottom spot for gas mileage on the 2015 EPA Fuel Economy Guide.
The 1969 Chevy Camaro Z28 had a combined fuel economy of 13 miles per gallon. The 2015 Camaro ZL1 — a contemporary equivalent — continues the tradition of fuel inefficiency with a combined gas mileage of 15 miles per gallon.
According to the 2000 EPA gas guzzlers list, the 550 Maranello is the least fuel efficient Ferrari model with a combined mileage of 11.8 miles per gallon.
Modern engines are fuel injected and start efficiently. Idling can use up to one half gallon of fuel per hour and cost up to 2 cents a minute.
The average U.S. fuel economy has climbed 11 miles per gallon, from 13 miles per gallon in 1975 to more than 24 miles per gallon in 2015.
The Toyota Prius Eco is the most fuel efficient car of 2016 with a fuel economy of 56 miles per gallon.
The decrease of carbon dioxide emissions by the average U.S. automobile is approximately 300 grams per mile. While individual models are emitting less carbon dioxide, total carbon dioxide emissions from U.S. transportation is continuing to increase due to population growth and increased travel.
Full-size motor homes have a fuel economy range of 6 to 13 miles per gallon.
The 2015 Mercedes-Benz G63 AMG got 12 city miles per gallon and 14 highway miles per gallon, the lowest in the standard SUV class.
Regular maintenance of your engine can improve gas mileage by an average of 4 percent, which equals a savings of up to 7 cents per gallon.
The Bugatti Veyron has a combined miles per gallon rating of 10 and earned Motor Trend's top spot as least fuel-efficient gas guzzler. The Bugatti has an 8-liter, 16-cylinder engine and an estimated annual fuel cost of $5,500.