version using a Lycoming O-540 engine, giving the PA-24-250 Comanche a top cruise speed of . Most 250s had carbureted Lycoming O-540-AIA5 engines, but a small number were fitted out with fuel-injected versions of the same engine. Early Comanche 250s had manually operated flaps and carried of fuel. Auxiliary fuel tanks ( total) became available in 1961. Electrically actuated flaps were made standard with the 1962 model year. Comanche 260 Four 260-horsepower (194 kW) versions of the Comanche were introduced beginning in 1965. They were: PA-24-260 (1965) PA-24-260B (1966 to 1968) PA-24-260C (1969 to 1972) PA-24-260TC (Turbocharged 260C) (1970 to 1972) A total of 1,029 airplanes were sold from the Comanche 260 line, including the 260TC. The 260 had an empty weight around and a maximum gross weight of . It had four seats, and a -capacity auxiliary fuel system was available as an option. Cruise speed was advertised as with fuel burn of . The 260B had an overall length more than the previous models due to a longer propeller spinner, not a longer fuselage. The 260B had a third side window and a provision for six seats. The fifth and sixth seats take up the entire baggage area and seat smaller adults, placarded to a total weight of . Typical empty weight was and gross weight was . Fuel burn was and advertised speed was . The 260C introduced a new "Tiger Shark" cowling, maximum gross weight of , cowl flaps, and an aileron-rudder interconnect. Cruise speed was advertised as with fuel flow of . To prevent possible aft center-of-gravity problems due to the increased gross weight and its fifth and sixth seats, the propeller shaft was extended. This moved the center of gravity slightly forward. With a useful load of , it has the largest payload of all of the Comanches except the 400. Often mistaken on the ramp for the 400 model, the slightly longer cowling includes a distinctively longer nose gear door, as compared to the B models and older versions. Starting in 1970, Piper offered a turbo-normalized variant of the PA-24-260 known as the 260TC with a Lycoming IO-540-R1A5 engine and dual Rajay turbochargers. Twenty-six were produced between 1970 and 1972. Advertised by Piper as a "second throttle", the turbochargers are controlled using a manual wastegate assembly that places an additional handle labeled "boost" next to the throttle handle in the cockpit, effectively creating