Mr Seldom,
Have you never been on a flight when the PA announcer (be he/she the pilot FO or FA) has announced that on this flight they had X tonnes of fuel o/b and would use X ammount meaning that the fuel consumption was X miles per gallon!!??
Get a life. The fuel comsumption or range of an a/c is hardly classified.
I have been on several post 9/11 flights where a/c arrival fuel has been announced on the PA. There was a distinct lack of gentlemen of middle eastern appearance frantically writing in their notebooks following this startling and candid revelation!!