http://www.micromatic.com/beer-questions/how-many-beer-kegs-dispensed-out-co2-tank-aid-89.html <div>As a general rule of thumb, it takes about a ½ Lb of CO<span style="font-size: 6pt;">2</span> to dispense ...<br /> </div> http://www.micromatic.com/where-can-get-co2-cylinder-filled-aid-90.html Average cost for filling a 5 lb cylinder is ... aid-90