Worst Overall Fuel Economy

Each year, the Environmental Protection Agency compiles its Fuel Economy Guide to educate car buyers on fuel-efficient vehicles. Find and compare estimates for all vehicles at fueleconomy.gov. The least fuel-efficient 2010-model-year vehicles are listed below.

Worst 2010 Model MPG Ratings
Vehicles are ranked by city mpg, followed by highway mpg and annual fuel cost.
Rank Make and Model City MPG Hwy. MPG Fuel* Annual Fuel Cost
Lamborghini Murciélago (manual) 8 13 P $4,200
Bugatti Veyron 8 14 P $4,200
Lamborghini Murciélago (auto)
Lamborghini Murciélago Reventon
9 14 P $3,818
Bentley Azure
Bentley Brooklands
9 15 P $3,818
Ferrari 612 Scaglietti (auto) 10 17 P $3,818
Ferrari 612 Scaglietti (manual) 10 15 P $3,499
Maybach Type 57 10 16 P $3,499
Bentley Continental Flying Spur
Bentley Continental GTC
Bentley Continental GT
10 17 P $3,499

Mercedes-Benz ML63 AMG
Ferrari 599 GTB Fiorano
Mercedes-Benz G550
11 15 P $3,499

Aston Martin DB9 (manual)
Aston Martin DBS (manual)
Mercedes-Benz CL65 AMG
Mercedes-Benz S600
Mercedes-Benz S65 AMG
Porsche Cayenne Transsyberia
Porsche Cayenne GTS
Maserati Quattroporte (4.2 L)
Mercedes-Benz CL600
11 17 P $3,230


*Fuel key: P=premium, R=regular

All miles-per-gallon (mpg) figures are from the 2010 Fuel Economy Guide, which is published by the Environmental Protection Agency and U.S. Department of Energy. Fuel Economy Guide data is derived from vehicle testing done at the EPA's National Vehicle and Fuel Emissions Laboratory in Ann Arbor, Mich., and by vehicle manufacturers that submit their own test data to the EPA. All vehicles are tested in the same way so consumers can compare the results when choosing a vehicle type or class. The mpg ratings appear on window stickers on all new cars and light trucks prior to sale.

Annual fuel-cost estimates are EPA calculations based on the assumptions that you travel 15,000 miles per year (55 percent city, 45 percent highway) and that fuel costs are $2.60/gallon for regular unleaded gasoline, $2.80/gallon for premium and $2.70/gallon for diesel.

© Cars.com 10/27/09