Fuel tank capacity is extremely low

So i don't know what they based it on but 3m long,0.8m wide and 0.8m tall fuselage has a volume of about 1920L of water while the game shows 829L of water
So somewhere around 42.7% of max capacity.
That's really low.
Best fix for now would be to add a tinker slider so anyone who thinks that a fuselage compartment is too small for max cap (like landing attachment etc) can limit that while still having 100% fuel showing on that tank during gameplay.
And a purely fuel tank fuselage can be set to 100% capacity.