Originally Posted by Dan333SP

You can get better life/pressure retention out of a tube by taking it out of the tire and "cycling" the pressure a few times. Pump the tube up to 150 psi or so, and then let all the air out. Repeat 7-8 times. Do this once every 2 days for the first 6 months you have the tubes, and you'll notice that they will hold pressure longer. You can also lubricate the tubes with baby oil (I prefer an overnight soak) which seems to help, and it also increased my average speed.

Sometimes they explode while cycling the pressure, but that's worth the risk because it's a real pain to check the pressure with a floor pump before every ride.