In S&R they list a fuel number for number of devices. What is that in? I mean does a autogyro need a new core each 2 hours? On a related note. How long does a 1lb ghost rock core typicaly last. Spacedog ______________________________________________________ Get your free web-based email at http://www.xoom.com Birthday? Anniversary? Send FREE animated greeting cards for any occasion at http://greetings.xoom.com