Performance: The MD-83 features increased fuel capacity as standard (to ), which is carried in two auxiliary tanks located fore and aft of the center section. The aircraft also has higher operating weights, with MTOW increased to and MLW to . Typical range for the MD-83 with 155 passengers is around . To cope with the higher operating weights, the MD-83 incorporates strengthened landing gear including new wheels, tires, and brakes, changes to the wing skins, front spar web and elevator spar cap, and strengthened floor beams and panels to carry the auxiliary fuel tanks. From MD-80 line number 1194, an MD-81 delivered in September 1985, it is understood that all MD-80s have the same basic wing structure and in theory could be converted to MD-83 standard.