I agree with you here, X-plane is the most realistic simulator out there and it would be amazing if PMDG could export the NGX to X-plane 10. Of course all the addon scenery's would be awesome to have in X-plane too.
To Jeff_B. After the routine maintenance an engine ground run is carried out to check for leaks from serviced components. A run is necessary to build up the required fuel and oil pressure in the various systems. At 80% N1 speed (the fan rotor is N1) the fuel pressure is over 550psi.