In addition, you need to look at the cycles the engines are subjected to before you try to compare reliability figures, even across the same type of engine.
You can hardly compare a mil. engine which spends an hour, say, cycling repeatedly between idle and full power and flying through all those nasty chemicals and the dust we find down below 5000 ft with a big fan sat at FL350 for 15 hours at cruise thrust. Engine wear is a complex game.
Mind you, was it the Soviet Mig-25 Foxbat engines which had a one flight life if the bird hit Mach 3?
Cheers, H 'n' H <img src="cool.gif" border="0">