Coach-man wrote:
hualing a ton of fresh water around is very wasteful! Water weighs a lot, about 7.5 lbs. per gallon.
TyroneandGladys wrote:
a full load of water is not going to effect mileage to any great degree and short of floods excess water will not kill you but not enough can and has.
Two conflicting statements here. You can figure out the real impact for yourself with some quick calculations:
The question is whether to carry a lot of water (even full) or carry a little bit of water (even empty.) So subtract the "little bit of water" from the "lot of water" amounts to get a number of gallons of "extra" water. Then multiply that number by 7.5 pounds per gallon to get the weight of the "extra" water.
Now take the weight of that "extra" water, divide it by the actual total weight of your RV (include the TV weight if a trailer) and multiply that by 100. That gives you the weight of that "extra" water as a percentage of the RV weight.
Now look at that percentage: if it's a big number (lots of water in a light RV) then it could make an important difference - probably not so much of a mileage hit unless you are in a lot of stop and go traffic or in the mountains, but maybe it'll affect performance. But if it's a small number (not a lot of water, and/or a heavy RV) then it probably won't make much difference at all.
If the percentage is low, then it doesn't matter where you fill, do it where it's most convenient (like at home.) If you think the percentage is too high, then fill up closer to your destination - just be aware that water may be hard to find (perhaps the campground fill station is out of order) or may be of questionable quality. If you get there, and the only water is really poor quality and the DW says it's too icky or smelly, what are you going to do? (Not all filters take out all contaminants or oders.) Also, if you use somewhere like a gas station, or a spigot at the campground entrance, remember that it might take some time to fill the tanks. (I recently had to wait about 20 minutes to park in my space at at a dry camping dog show because another trailer was blocking my site while they were filling water at the common spigot.)
For me, it's an easy decision: the difference between a full tank and 7 or 8 gallons is only 1.7 percent of my total weight. Not much difference at all. So I always travel with a full tank since I do so much dry camping, and it's so much easier to fill up with known good quality water at home, rather than search for (potentially poor) water at the destination or at a truck stop/gas station/etc.
But it's a decision everyone must make for themselves: the smaller the rig, or the bigger the tank, the more of an issue it is. But if you work out the actual percentage, you might be surprised that the difference isn't nearly as big as you thought.