For Raven I
Depends (of course on) Temp/Hight and map setting.
'Forcing' (=max continuous) will increase consumption a lot and need at least 16 USG
Being more economic even by reducing to 100 knts IAS, and not being at MTOW would more go towards 15 USG
Mixing with work such as pipelines can push it down to 14.
So the general range I see is 14-16 USG.
I have seen on different threads that this would be marginally higher for the RII
delta3