The designs on the GE9X which will be used to power the B77X are yet to be finalized, they say by 2015. These engines will have 10% lower fuel consumption than the GE90-115B-powered 777-300ER and a 5% lead in specific fuel consumption over the RR Trent XWB engine on the A350. So I'm sure SQ will keep an eye out on those developments too. 10% lower fuel consumption and they might re-look their current B777 fleet too.
Last edited by fromdgrndup; 25th Jan 2014 at 23:00.