Originally Posted by
Gary et al
I've seen sustained 2000lbs a side with .80 FL390 with the LEAP...only about 80 people onboard though.
I've also seen 2500 a side with the LEAP down at 330 doing .80 with a full load.
I'm sure the actual fuel burn differences between the leap and Pratt are negligible when you average over 1000s of flights.
Anecdotally by looking at the fuel flow gauges at various altitudes and Mach speeds the burn comparison between the LEAP and the P&W might seems negligible but let’s suppose for a moment that the new technology of the geared turbofan provides even a slight increase in efficiency. Perhaps .25 of 1 percent, although it may very well be greater than that. That increased efficiency over 1000’s of flights equates to a large and certainly not negligible savings.