In the absence of any comprehensive battery and heat benchmarks so far, I was wondering if anyone had any ideas/thoughts on the question. Last year's MBA Sandy Bridge i5 and i7 models showed little difference in battery life according to Anandtech, though I can't remember the exact margin. However in terms of heat there were a lot of anecdotes on this forum that the i7's were running hot on idle compared with the i5's (a major turn-off for me). Now given this, normally I wouldn't hesitate to get the i5, except for the fact that early benchmarks are showing an even greater performance difference between 2012 11" model i5 Vs 2012 11" model i7, around 25%. For some reason, the geekbench difference between the two 2012 13" models is minuscule (anomalous result?). I'm aware that this won't translate into a noticeable difference for everyday performance but I am tempted by this power difference for those times where I will stress the machine (eg video encoding). But it depends on heat and battery differences. I've seen conflicting posts on this around the place already and I'm not sure of the technicalities. Intel have confirmed that both the ivy i5 and i7 will run at 14W, but is that necessarily an indication of identical power draw and battery life? And what about heat, anyone know the technical differences as to why the i7s were hotter idle last year and are those differences still present this year?