STONELEIGH, WARWICKSHIRE, U.K. --- McDonald's announced plans to convert its British delivery fleet to operate on biodiesel largely made from its own recycled cooking oil, Reuters reported. The company has 1,200 fast-food restaurants in Britain. Last year, McDonald's used 6 million liters of diesel to power its fleet. Matthew Howe, senior vice president of McDonald's U.K., said he expects to completely replace that with biodiesel. McDonald's began launching its rollout this month with half of its 45-vehicle biodiesel fleet based in Basingstoke. In about 12 months, all 155 delivery trucks are expected to run on biodiesel. Initially, the biodiesel will consist of 85 percent used cooking oil gathered from about 900 McDonald's restaurants and 15 percent pure rapeseed oil. "As we get better at the refinement we will be able to remove virgin rape [oil] from the process," Howe told Reuters.