America’s Least Eco-Friendly Vehicles

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15. Dodge Viper
> CO2 released per mile: 623 grams
> Fuel efficiency: 14 mpg
> Annual fuel cost: $3,000

14. Rolls-Royce Ghost
> CO2 released per mile: 627 grams
> Fuel efficiency: 14 mpg
> Annual fuel cost: $3,000

13. Rolls-Royce Dawn
> CO2 released per mile: 627 grams
> Fuel efficiency: 14 mpg
> Annual fuel cost: $3,000

12. Toyota Sequoia 4WD FFV
> CO2 released per mile: 632 grams
> Fuel efficiency: 14 mpg
> Annual fuel cost: $2,600

11. Rolls-Royce Phantom Coupe
> CO2 released per mile: 638 grams
> Fuel efficiency: 14 mpg
> Annual fuel cost: $3,000