I seriously doubt they are intentionally doing this. Even on their largest aircraft the water tank holds about 300 gallons. That's about 2400 pounds which is a good amount of weight, but shaving off 1200 pounds is not going to shave that much off the fuel bill. And if it's a 777, the tank is smaller than this, so in the end, even less savings. Sounds more like some laziness going on.
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