I was camping a couple of weekends ago with some friends. As we were getting ready to leave they noticed I was filling my water tank. Two of them had gas motorhomes. They asked me why I was filling the tank to leave. I told them the extra weight (over 800 pounds) made the ride much smoother in the DP. They asked if the extra weight didn't take away the power. I pointed out how I couldn't even feel it and the MPG never seemed to change. Both of them make sure their tanks are near empty to leave. And I know why. I remember when I had my gas rig with the V-10 I could easily tell how full all the tanks were based on acceleration and even handling. With the DP the only thing that tells me how full the tanks are is how sharp the bumps are when I hit them. The sharper the bumps, the less fluids in the tank. The smoother the ride, the more fluid I have on board. A full diesel tank and a full water tank make for a nice ride.