$5.00 or $33.00 per gallon
The production of algae is continuous unlike crops which have a limited number of harvest per year, algae can be grown in places were other crops cant be grown. so they don't have to compete with the crops that grow on land. algae is a nonrenewable resource which means when you use it its gone and you have to buy more.
Algae Fuel Could Change the World | World's Strangest