1st HR: 1900 lbs (dont forget approx. 100 for taxi!)
last HR; 1100lbs
1500Lbs for every HR in between
That averages out to 1500 lbs per HR. Those numbers work real well for trips under 3.5 hours operating at FL400ish (390-410)
On longer trips it works out to be more like 1400 Lbs for every hour inbetween.
However, that is for High Speed Cruise. ie. Barber Pole -5 kts. which is roughly Mach .78
If you are looking to get your 5:30 HR range that will be in LRC and you can count on
1st Hr: 1800 lbs (taxi fuel included)
last HR: 1000 lbs
1300 lbs for every hour inbetween. (1350ish for begning of flight decreasing to 1250ish near end of flight)
Starting at FL390/400 and working your way up to FL430 for the last 1.5 Hrs.
Hope that helps.