If you're looking to purchase a car for your road trip, you might want to consider some of the models recommended by the American Council for an Energy-Efficient Economy (ACEEE). The ACEEE recently released its list of the most eco-friendly vehicles of 2007. The natural-gas powered Honda Civic GX came out on top, followed by the Toyota Prius, the Honda Civic Hybrid, the Nissan Altima Hybrid, and the Toyota Yaris.

Other Asian imports rounded out the top 12 while domestic cars and European imports dominated the list of cars dubbed "meanest for the environment." These include the Volkswagen Touareg, the Mercedes-Benz GL320 CDI, and the Lamborghini Murcielago.

The ACEEE compiles its list based on "green" scores. These scores are a measure of a car's tailpipe emissions, fuel consumption, and emissions that contribute to global warming.

Links: Greenest Vehicles of 2007 (GreenerCars.com)
Highlights of the Model Year (least environmentally-friendly automobiles and industry trends, also from GreenerCars.com; subscription required for some content)
American Council for an Energy-Efficient Economy

Photo: Honda Civic GX