SR-71's J58 SFC quoted at 0.9 lb/lf-hr (dry)
Oly 593 quoted at 1.19 or similar (dry)
Presume these figures are not comparable, if Olympus reckoned to be the most efficient of the dry supercruise engines - think this discrepancy is that J58 is fundamentally a wet ramjet in cruise, and a smaller core? (OLy usually quoted as the largest core fo any gas turbine?)