Saudi Aramco has signed an agreement with five companies to provide domestic customers with a new grade of petrol from early 2007. The new grade will be 91-octane, and will be sold alongside the existing grade of 95-octane gasoline. Studies have confirmed that the majority of vehicles in the country are designed to use the 91-octane, or premium, gasoline. The price of 91-octane gasoline has been tentatively set at SR0.82 (about $0.22) per liter, with 95-octane selling for SR1.02 (about $0.27) per liter. In January 2006 a nationwide campaign will be launched to educate consumers on the two grades of gasoline.