a bit late here, but just a detail:
a burn rate is given for a specific flight regime with a specific airframe (airflow inside it and airflow outside it), if the air ducts and the aircraft aerodynamics aren’t the same, you end up with different fuel consumption for a given flight regime than on another aircraft type (or same type with different aerodynamics from the expected ones)
for example:
flight @0.8M @ 25000ft
you expect to burn (supposition) 10kg of fuel per minute.
but your aerodynamics are crap and your aircraft has twice the drag you included in your estimation. as a result, your engine has to produce twice the thrust to give you the same flight regime: 0.8M@25000ft… that higher thrust requires a higher fuel burn rate than expected
this does not holds any water.
its verfied gripen DEMO tests that, with one drop tank (450 Gal) gives the Gripen DEMO an extra range of approximately 1000 km (subsonic). that means lesser fuelburn than expected
The only way this holds any water is the fact the Demo A/C is equipped for the F414, less efficient intakes for 1,4mach+.
But that have nothing to do with e E/F modell, only the current Demo A/C
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