I didn't realize that a bobcat could use that much oxygen in 6 hours. I'm thinking K tanks so maybe I'm wrong. I have used a K tank in 6 hours, or there about, when pulling vac stacks with a Mirage. But for everyday use a K tank will last a day to day and a half with my Mirage. 10 to 18 hours using the outer flame once in a while but not very often.
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