The following 'Howgozit' graph for the Vulcan shows a burn rate of about 10000 lb per hour at FL400 and about 12000 lb per hour at 250 KIAS at low level:
That was for XH561 on 18 Mar 1980; we had a 181000 lb TOW for a 4:15 flight at high level. Whereas XH558 is much lighter and burns a lot less fuel.