Camel or Mule?

Which is better a Camel or a Mule? When it comes to traveling long distances or staying somewhere without water the answer is definitely a Camel. Some folks are mule-headed about not filling their fresh RV drinking water tank before leaving home (or their current location) because of the fuel savings they think they’ll achieve by not hauling the extra weight. Well, do you have first hand experience to prove this?