I don't understand how they will actually remove the humidity from the aircraft in order to actually reduce weight while in flight? Silica gel only sequesters the water vapor, the weight is still there until you replace the adsorbing material. Do they actually plan on jettisoning it en-route?
I can understand the "increasing comfort" part (by actually making cabin air moister and hence more comfortable for humans) but the fuel saving part sounds like total
PR bull to me, and I'm not even considering the power requirements of these gadgets. Guess what that power will inevitably be generated with??