A Washington, D.C.-based, non-profit research group, Greenercars.org, is dedicated to advancing energy efficiency as a means of protecting the environment and strengthening the economy.
The clean and dirtiest designation are part of ACEEE’s Green Book, a unique consumer resource website providing Green Scores rating the environmental friendliness of every vehicle on market. ACEEE, ranked the cars by their gas mileage and assigned the cars a green car score.
Here are the top-three in the best and worst categories:
Cleanest — Honda Civic GX, Toyota Prius, Honda Civic Hybrid; Dirtiest — Lamborghini Murcielago/Murcielago Roadster, Bugatti Roadster, Bentley Azure/Brooklands.
To read the complete list, visit: greencars.org.
Article Last Updated: March 27, 2026.
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A sports, travel and business journalist for more than 45 years, James has written the new car review column The Weekly Driver since 2004.
In addition to founding this site in 2004, James writes a Sunday automotive column for The San Jose Mercury and East Bay Times in Walnut Creek, Calif., and monthly auto review and wellness columns for Gulfshore Business, a magazine in Southwest Florida.
An author and contributor to many newspapers, magazines and online publications, co-hosted The Weekly Driver Podcast from 2017 to 2024.
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