Convert from cubic inch to drum [US, petroleum]

Unit Definition (cubic inch)
The cubic inch is a traditional unit of volume in English speaking countries. One cubic inch equals 1/1728 = 5.787 037 x 10E-4 ft³, 16.3871 cm³, 16.3871 milliliters, 0.5541 U.S. fluid ounce, or 0.5767 British Imperial fluid ounce

Unit Definition (drum [US, petroleum])
The drum [US, petroleum] is a unit of volume sometimes used in the oil trade. The traditional standard drum of oil contains 55 U.S. gallons or about 208.198 liters. One 55-gallon drum equals 1.3095 barrels.