I don’t know if it is just me, but since I installed MacOS 10.7.3 I notice unusual high numbers of battery life on my MacBook Pro.
The battery life used to be somewhere in the same ballpark under Snow Leopard, but admittedly Lion changed battery life for the worse. I’d be happy to see an improvement, but so far I found no hints on the Web indicating a big change towards better numbers.
After more than 3 months of using OS X 10.7.3 on my MacBook Pro it is safe to conclude that the update has definitely improved battery life. After a couple of days of using OS X 10.7.4 I am quite confident that the drop experienced in 10.7.0 to 10.7.2 is now history.