You'd be surprised what advances in tecnology can do for performance 762er, I'll get some more precise fuel numbers of the next flight plan I use on these flights for comparison, but for now here's some rough figures.
Flight 14, last time I operated as First Officer Hnl-Ewr.
Take off weight 432000lbs, flt time appx 8hrs, departed with 116000lbs fuel arrived with 26000lbs burn off 90000
The last time I operated Rio-Ewr on the -400 I compared
fuel burns with the 10 that we deadheaded back on there was an 80000lb difference.
Consider that you have a two engine aircraft that weighs far less, Max GTOW 450000lbs versus 572000
that was designed with fuel economy in mind and it starts to make sense.
On the 10 they were lucky to get the total fuel flow down to 15000 lbs per hour towards the end of the flight
when they were light, the most we burn is 12000 lbs per hour and its usually closer to 10000. While half is a bit much 40% is realistic and thats pretty impressive.
The best contribution to safety is a competent Pilot.