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P.S. gas prices (and calorific values) of course change over time, so they have no way of knowing when the missing gas was used. I wonder which part of the period they assume it was used in ?

I forgot to mention, in my anecdote, they billed it as if all the electricity had been used that cycle. And since they used a sliding scale, and it was durring our enron caused energy crisis, the bill was rather inflated. They happily pro rated it over the previous months.

Matthew