I have the same issue as the original poster. Since I upgraded to Diablo, battery usage has become inacceptable (but then I'm used to that from my N82....grrrrrrr!). Might be because I backuped/restored before/after the upgrade, and got into lots of troubles with the Application Manager being unable to resolve things, so something might be screwed up.

Will reflash to Chinook and report back, but there IS an issue.