<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">that the CO2? How often do you have to refill or reorder the tank? </div></BLOCKQUOTE>
Check
http://www.powertank.com website. They have the actual figures. But its difficult to say, depends on how big your tires are and how low you air them down when roading. But a 10 gallon tank isn't going to go empty on you in just a couple of air ups... Also the air compressor is just another thing that can wear out or break. CO2 is safe, portable, and cheap.