CliveL
You got me a little worried there, so I've just checked the figures I quoted in case I'd slipped up! They were extracted from the Cruise Control Manual (rather than from observation on an actual flight) for a lecture some years ago.
I'm relieved to say they appear to be correct. By way of contrast, to show the variation in fuel flow there could be, the following is perhaps typical of Concorde approaching her decel/descent point into BGI.
Concorde Cruise/Climb. 110,000 kgs, FL600, ISA -15°C:
Fuel Flow in Cruise/Climb, Reheat OFF:
- 4e...FL600...M2.00...1,107 kts...4,308 kg/eng/hr...17,232 kg/hr
Best Regards
Bellerophon