As well as being quieter and more powerful, the CFM56 was up to 23% more fuel efficient than the JT3D, which reduced operating costs and extended the range.
Udover at være mere stille og kraftigere var CFM56-motorene 20% mere brændstoføkonomiske end P&W JT3D, hvilket nedbragte omkostningerne og udvidede rækkevidden.