Tokyo tanks

Tokyo tanks were internally mounted self-sealing fuel tanks used in the Boeing B-17 Flying Fortress and Consolidated B-24 Liberator bombers during World War II. The tanks increased the B-17's total range at combat weight with 4,000–5,000 pounds (1,800–2,300 kg) of bombs by about 1,000 miles (1,600 km) and the combat radius was doubled to about 650 miles (1,050 km). Although nicknamed "Tokyo" tanks, the name was also hyperbole in the fact that no B-17 ever had the range to bomb Japan from any base in World War II.