As counter-intuitive as it may be, that's actually not a bug. It really did suck a lot less gas in wep than it did in military. The reason for that is because the engine had to run a very rich mixture at military but at wep it's using water injection and doesn't require such a rich mixture. As a result, when the water started to flow, it closed a jet in the carburetor and weakened the mixture which cut down the fuel flow considerably.
