Hey all, I originally purchased an i5, 256, 4gb 13" air, but decided to order an i7 with 8gb of ram. Currently have both machines and I've noticed a considerable battery life difference between the two. On both machines I ran ms word with one document open, and chrome with macrumors and facebook open. Brightness on the 3rd to last setting, backlit keyboard on the very minimum setting. Running on wifi, no bluetooth or anything like that open. Both machines are identical in that they have the same settings, software, and data on them. The i5 reports a battery life of around nine hours, while the i7 gives an estimate of around 5. Installed the newest updates on both machines and there are no differences in estimated battery life. I think one possible issue may be that I used migration assistant to transfer everything from the i5 to the i7. I'm wiping the machine atm and starting fresh to see if this makes a difference. Went to starbucks the other day with the i5 and was there for close to four hours using chrome, word, and spotify and I walked out with 65% battery left. That's pretty phenomenal compared to other laptops I've used. I understand that the the figures above are only battery life estimates, and that there may be a number of factors affecting this, but if any i7 owners could provide some battery life estimates just for comparison that would be great.