Design fuel capacity was 3,300 L (870 US gal) in wing-mounted self-sealing fuel tanks. A possible modification was offered – a 500 L (130 US gal) auxiliary fuel tank in the aft fuselage. Calculated endurance with standard tanks was about three hours, for 1,335 km (830 mi) range (using calculated maximum cruise speed). Endurance and range using economical cruise speeds are not available, but should have been better. For example, the Savoia-Marchetti SM.79 "Sparviero" could boost its range from 1,750 km (1,090 mi) at 350 km/h (220 mph) to 2,300 km (1,430 mi) at 260 km/h (160 mph).