JR,
Your 84 kg number is for older aircraft prior to SN 250 unless modified.
On this aircraft it would be ~ 48 + 44 = 92.
Unless of course you notice how a 135 flies in the cruise left wing low and in truth it is ~ 83 kg as the fuel falls
forward over the fence on the LH front corner of each supply tank back into the main tank.
In the cruise you will have something like 45 + 38 indicated.
95 litres was removed from the system.
Less ~ 9.45 unusable = say 85 litres usable at best as there must be some unusable in the supply tanks. 69 kg.
Unusable fuel with FWD Transfer failure above 80 knots = 59 kg.
10 kg (12 litres) the difference and where?
Given the possible attitude with NIGHTSUN, FLIR, FLOATS (assuming they were fitted) that unusable figure could be higher.
Yes 25 minutes available if you just use the bare figures and a total but I would say in the cruise at 22 minutes you would be into the first engine failure and the second at 26 minutes due to the bias in the tanks.