Run the compressor from empty all the way up to a full 60-80 gallons of compressed air.
Feel how hot the tank is.
When that sucker cools off, a large amount of moisture falls out of it because hot air can retain a higher amount of vaporized water than cold air. (This is why we get water running out of the dain under our cars with the A/C running and why cold coke cans sweat when placed outside on a hot day).
Leaving it full allows the tank and your lines to sit and cool, and the condensation to fall to the bottom of the tank where you can drain it... instead of it being blown through your brand new airtools.
A full compressor means dryer air.
Obviously this only applies to intermittent use - to inflate tires or zip off a few lugnuts. Running a sandblast cabinet or a D/A sander, you'll be running it enough that cooling, separators and filtration matter.
But for recreational light use, an always-full tank is best.
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