If we stay with this example, the general cargo ship requires "only" about 1,300 tons of fuel for a voyage to the Far East; while the container ship has to carry nearly 11,000 tons of fuel oil unless it is to replenish its bunkers en route which again, of course, involves a loss of time.
Ukuba sihlala nalo mzekelo, inqanawa yokuthutha umthwalo jikelele ifuna malunga newaka elinemakhulu amathathu eetoni qha zepetr-oyile kuhambo ngenqanawa oluya kwiMpuma ekude, ngexa inqanawa yesikhongozelo ifuneka ithwele phantse namawaka alishumi elinanye leetoni ze-oyile yepetr-oyile ngaphandle kokuba kufuneka kuzaliswe kwakhona indawo zamalahle ne-oyile enqanaweni ezithi kwakhona zidibanise ukulahleka kwexesha.