<prompt> Translate the following text to English1.20 lbs mmBtu, mara 50 ya tofauti, juu ya msingi wa Btu, kati ya msingi wa kitengo na matumizi ya mafuta ya kitengo kwa sababu ya uwezo wa asilimia 60.  <response>: 1.20 lbsmmBtu multiplied by 50 percent of the difference, on a Btu basis, between the units baselineand the units fuel consumption at a 60 percent capacity factor. 