Originally Posted by RetiredFPD
Water = 8.2 lbs per gallon. Gas 5.5 lbs pg....diesel 6.3 lbs pg do the math and figure how much fuel it's costing to haul water. Just in a 12 gal HWH is a hundred (98) pounds of weight.
Your numbers are good but i believe the logic behind the math might be in error. There is a lot more to mileage than just weight. We know for example that it takes more fuel to move 30,000 lbs up a grade than it does on level terrain. It's all about Horsepower.
looking at just the numbers, my MH weights 29,000 lbs. If I add 1,000 lbs of liquid, I have added about 3 % to my net weight. At the worst, this might add 3% to my MPG which would equal, if i normally got 9 MPG, 0.27 MPG
Also I bought a self-contained unit to be able to stop wherever/whenever we want so I fill the tanks.