Thanks 747FOCAL, but isn't thrust specific fuel consumption the same for all aircraft that use the same engine.
TSFC depends on the thrust not the type of aircraft. The fuel consumption is different for each every aircraft because the drag is different and therefore the amount of thrust required is different. TSFC is measured against thrust ie lb/hr/lb, not in fuel flow per hour.
I have since find that the BR715 has a tsfc of 0.62 anyways.
Cheers
eagleboy