You need to do something about your power measurement methodology. How can you claim 10 W average idle draw and then 22 hour idle endurance? That would take about 220 Wh. Yes, nominal capacities are typically determined at a much higher draw where it's going to be less. But not 70 Wh. Also, your load average is 53 W. And yet load endurance is almost 4 hours. Again, 200 Wh territory. I guess you could be using two different loads but these numbers don't make much sense. I'm expecting to see a relationship between the two.
I imagine the problem is simple - you measure power consumption at the wall while endurance, obviously, on battery. So the laptop can do two different things. Thing is, I'm not that concerned with power consumption when I'm powering it from the grid. It's interesting from cooling perspective, but not beyond that.
I would appreciate more performance testing on battery. Especially with ultrabooks. These things are built to be used on the go, without external power supply.