He is arguing, because he thinks that we're saying the energy usage is 1/2 on 240 than it is 120, and no one here that I can see is claiming that.
Oh, no, its less current (A), half as much. Same wattage And maybe 0.5% to 4% less power consumption due to easier step down and AC/DC conversion efficiency, nothing to do with what we were talking(arguing?) about.