02/27/2009 05:12 am ET Updated May 25, 2011

The Most Fuel-Efficient Cars Of 2009

Most Efficient Two-Seaters

1. 2009 Smart Fortwo Convertible and Smart Fortwo Coupe
These cars get 33mpg city and 41 mpg highway. They use 9. 5 barrels of petroleum a year and only emit 5.1 tons of CO2. Check out the upcoming electric drive smart fortwo.

2. Pontiac Solstice
This car gets 19 mpg city and 28 mpg highway. It uses 15.6 barrels of petrol a year and produces 8.3 tons of CO2.

3. Saturn Sky
The Saturn Sky gets 19 mpg city and 28 highway. It also consumes 15.6 barrels of petrol and produces 8.3 tons of CO2 annually.

Read more on planetgreen.discovery.com