For -30 suggest running cost at $9000/hour if you own it for an ACMI lease will be about > $5500/hour.
Forget C2B not around today(if so are used as per C2 performance) and were only every used for the 267T version. For the C2 ball park figure would be 7.5T/hour on a trip greater than 5 hours. If you are switched on and use decision point fuel planning this is a good way of keeping the fuel cost down. If the crew is good they will maximise the use of optimum levels and trade altitude for wind graphs. Should all ways make fuel on the CFP
For a 259T aircraft you can haul 69T out of an airfield with 3200m R/Way at 25C 1000' PA and a 5knot tailwind
Fuel cost today is about 58 cents a litre
Should imagine that will beat a tristar which I would think is comparable to a -10