Battery measurements will jump around even on a healthy battery. It's too bad people are getting are these measurements but they are not really informative. It's a feature of a high performance laptop that happens when you start packing the chassis with performance oriented components. It will drain the battery faster. These MBPs are trying to straddle the space between thin and light on the one hand and performance and the other. Something has to give. If anything, Apple's marketing is to blame because it leads to unreasonable expectations and or confusion about battery rate of drain and battery health generally.