... HHV of each fuel from HHVϭ17,6 45 ϩ 54 (ЊAPI), or for 24Њfuel, HHVϭ17,6 45 ϩ 54 (24)ϭ18,941 Btu / lb (44, 057 kJ /kg). For the 28Њfuel, HHVϭ17,6 45 ϩ 54 (28)ϭ19, 157 Btu/ lb (44 ,55 9 kJ/kg).Compare ... gal)ϭ3 15 gal/ h (1192 L/h).The daily fuel consumption is then (24 h / day)(3 15 gal/h)ϭ 755 0 gal/day(28 ,57 7 L / day). In 7 days the engines will use (7 days)( 755 0 gal /day)ϭ 52 ,900,say 53 ,000 ... costper 10,000 Btu (10 ,55 0 kJ)ϭ$0.08 25/ [(18.941/ 10,000)(7 .57 8)]ϭ$0.0 057 4, or0 .57 4 cent per 10,000 Btu (10 ,55 0 kJ). For the 28ЊAPI oil, cost per 10,000 Btuϭ$0.0910/[(19, 157 / 10,000)(7387)]ϭ$0.00634,...