The U.S. government provides a list of the least fuel efficient 2006 passenger cars. Here are the bottom dwellers each category. Each model’s number of cylinders, engine size, transmission type and mpg (city, highway) are also listed.

  1. Least Efficient Two Seater - Bugatti Veyron, 16cyl, 8L, Auto(6) 8 15
  2. Least Efficient Minicompact - Car Aston Martin V12 Vanquish S, 12cyl, 5.9 L, Auto(S6) 11 17
  3. Least Efficient Subcompact Car - BMW M6, 10 cyl, 5 L, Auto(S7) 12 18
  4. Least Efficient Compact Car - Bentley Continental GT, 12cyl, 6L, Auto(6) 12 19
  5. Least Efficient Midsize Car - Bentley Arnage, 8 cyl, 6.8 L, Auto(4) 10 14
  6. Least Efficient Large Car - Bentley Arnage LWB, 8 cyl, 6.8 L, Auto(4) 10 14
  7. Least Efficient Small Station Wagon - Audi S4 Avant, 8 cyl, 4.2 L, Man(6) 15 21
  8. Least Efficient Midsize Station Wagon - Mercedes-Benz E55 AMG, 8 cyl, 5.4 L, Auto(S5) 15 21