Get more mileage out of your desert tank by blowing it up… No, not literally! Take a clean, empty tank, shut the petcock, and fill it full of steaming-hot water (not boiling water, though—that's too hot). Once you have the tank full, carefully replace the cap. Pressurize the tank with an air nozzle through the breather hole in the cap. Be careful to stay clear of the breather vent, as very hot water could blow back out and you risk burning yourself! The pressure and heated water will slightly stretch and expand the tank. Believe it or not, you can usually gain one to two quarts of extra capacity by doing this. Think we're crazy? Well, watch the water level drop to measure your success. When you are done, let the water cool and then dump it out. Be sure to dry out all water residue before filling it up with fuel.