I actually measured the energy usage with a Kill-A-Watt with and without mining a few months after that post, and I was getting 160 BTC/kWh. Because the cost of mining 1 BTC was less than a tenth of what BTC was actually priced at at the time, I thought that BTC was substantially overpriced, and so I also have the honor of selling BTC at the lowest prices ever recorded, $0.003/BTC.