fuel consumption of european engines

I think I need some help. I tried to compare EJ-200, M-88-2 and RM-12. I searched for their fuel consumption, but I found only number in different measurement systems. So I had to do some mathmatics. The outcome was a bit courious for me: RM-12 worst, EJ-200 best. EJ-200 is strongest of them. Especially that M-88 seems to need more fuel is courious, as it is as new as EJ-200 and provides fewer thrust. I found no mistake in my equations. Damn it ! Where is my mistake ? Or needs IR-signature reduction so much fuel ?
Thanx Aurel.