Travelling to hookup site we carry 1/2 to full tank FW. Travelling to boondocking site we carry full (110 gallons).
Never had a problem on the road. With over 900 pounds of fresh water, I can't tell the difference in weight or mileage with our 2017 F350 DRW (900+ft-lb torque). I tend to hold my gray water for rinsing the system when we dump. It is a relatively "closed" system; occupants convert FW from tank and food from cupboards to waste in black & gray tanks. Weight should be relatively constant, just shifted around. Fuel consumption drops weight, grocery store adds weight. But I sure can't detect any appreciable difference in performance from our TV.
I've always just used the systems like I want and never had any problems on the road.
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