Got curious, taken today from the FF indicator
I was doing a maintenance acceptance flight today of a 206JRIII (Allison 250-C20) with fuel flow indicator, it gave me the following reading´s
Flat Pitch, Idle, 8%TQ = 7.8Gal/Hr
Flat Pitch, 100%NR, 22%TQ, = 13.6Gal/Hr
In flight, 50%TQ, = 18.3Gal/Hr
In flight, 60%TQ, = 20.5Gal/Hr
In flight, 80%TQ, = 26.3Gal/Hr
In flight, 100%TQ, = 30.7Gal/Hr
All of these were taken between 7,600 and 8,500 FTAMSL so I think readings would be a little higher at SL
Save for reference.