Trying to decide between the i5 2.6Ghz and the i7 2.8GHz. According the Anandtech, for the MBA, the battery life for the i5 is 18% better than the i7 on heavy loads. http://www.anandtech.com/show/7113/2013-macbook-air-core-i5-4250u-vs-core-i7-4650u/4 Do you think that it's the same for the 13" MBP too? Anyone know much the i7 boosts performance? I searched the net for benchmarks on those CPUs (i7-4558U v. i5-4288U), but came up with nothing.