The Channel Islands National Park research vessel, Pacific Ranger, underwent a greening project that reduces its environmental impact while operating in sensitive marine areas. For the past 20 years, the vessel has regularly served as the Park research platform and has consumed more than 185,000 gallons of petroleum diesel fuel. Changes made to eliminate further petroleum diesel fuel consumption include utilizing re-refined motor oils and a "Purafiner" filter system, using battery storage and AC inverters instead of generators, installing a "Bulbous Bow" that reduces friction in the water, and operating the vessel on 100 percent biodiesel fuel. The overall impacts of this conservation project reduced the annual fuel consumption of the Pacific Ranger by 24 percent. Annually, this project has eliminated the use of more than 10,000 gallons of petroleum diesel fuel. The project reduced demand on petroleum resources, decreased exhaust emissions, demonstrated alternative fuels in marine service, and made the Pacific Ranger petroleum free.