Algae shows the ability in a standard engine.

Algaeus has begun its drive across America: the trip is started from San Francisco September 8 and will take 10 days to make it to Washington, DC. The first algae-fueled vehicle called the Algaeus is promoted from group responsible , the Veggie Van Organization, expects the car will only in need of 25 gallons of fuel to finish the entire journey..
The car is a converted plug-in Prius outfitted with a nickel-metal hydride battery and filled with a blend of 5 percent algae and 95 percent gasoline .
A 5 % blend of algae is not a great percentage but is a strong signal the start of an algae revolution, and it does mean that progress is being made on fuel with great potential and this road tavel lets people look the progress in action. The mission of the Algaeus is to show the ability of algae to be used in a standard engine.
The true reason of this event is not only this, but it wants also promote the film FUEL that discusses solutions for our dependence on external oil and opens on September 18th, the day the ALGEUS will arrive at its destination.