CHENNAI: The member base of PetroBonus programme, launched by Bharat Petroleum Corporation, has reached the two-million mark. PetroBonus, which completed its 10th year in September, has a pan-India presence covering more than 75 major cities. The programme offers its members the convenience and rewards while purchasing the fuel. BPCL kicked off celebrating the 10th anniversary of PetroBonus from September 29.