I'd love to get more clear on what's going on here...
I've now done two SMC resets. Both times, it seemed to help at first (according to the estimate of time remaining and power consumption). But after a cycle—or even at the end of the same cycle I did the SMC reset on—it became clear that the effect was minor, if anything at all.
I'm on my 6th cycle now. I just unplugged from power and originally the estimate was 6:10. It has now climbed up to 7:49. The reason the estimates vary so much is that the power consumption jumps all over the place. When I first unplugged from charge it was 686 mAH. Now it is 282 mAH. A second later it is 372 mAH. Now my time remaining estimate is 7:59.
But despite all of this fiddling around, the cold, hard truth is that I've never managed to get over 7.5 hours on a charge when I've tracked the actual usage.
Question for all of you: what battery life are you now seeing, with actual use (not estimates)?