With mine, the amount of charcoal has a very nonlinear dependence on the temp. If I'm running at 250, half a bag will run me about 3 hours. If I crank to 260, half bag lasts for about 1-2 hours. If I'm running at 210, I can go 12 hours+ on a bag -- very good for overnight butts. One other thing to check is the thermometer. Mine was off by about 50 degrees(!) when I calibrated it.
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