Here's my numbers...
The F-15C carries 13,455 lbs fuel internal
11,895 ext.
At full afterburner, each engine will burn .7 lbs per fuel per hour per lb of thrust.
Each engine is rated at 23,930 lbs of thrust at full burner.
So I've got the plane eating 33,502lbs of thrust per hour.
or 558 lbs per minute.
So if all the above is correct, would'nt the F-15 be tanks dry in just over 24 mins?
Unless they were carrying external tanks, the earlier mentioned article seems highly unlikely.