Hi. I came across a discussion in this forum (http://forums.macrumors.com/archive/index.php/t-1193406.html) that touched on the battery-life impact of the i5/i7 choice, but did not offer the ultimate answer. Can anybody compare battery lives of i5 and i7 (13'')? I have seen a number of detailed i5 battery tests, but none for the i7. For long flights, I would forego the i7 if the i5 beats by as little as 5% (20 minutes / 400 minutes), I think -- almost certainly if by 10%. Having both configurations and running the same tasks would give a great idea, but not many people have access to that. Thanks!