I just bought a 50" Panasonic PX80u plasma at Best Buy. They were trying to push their ISF calibration services regularly $300 for $100. They told me that with this calibration it would reduce the energy consumption of the tv by 30-50%, thus saving me me money. He explained to me this was done by using improved software in the tv. Is this true. I thought the calibration was for adjusting the grey scale. Your input is appreciated.