If any of you have a MacBook Air, I'd appreciate if you could try the following simple experiment. Fully charge your machine. Close the lid (putting it to sleep). Disconnect the power and go to bed. Eight hours later, open it up and tell me how much juice is left in your battery.

My MBA: 68% left
A friend's MBA: 91% left

Something appears to be funky about the battery drain rate in my machine.

If it turns out that something is fubar with my MBA, what am I supposed to do? Call up the local Apple store and arrange for a replacement? I'm worried they'll want to just replace the battery with another one (presumably, under warranty), when the issue may well be a logic board fault of some kind that's consuming way more power when asleep.

Thoughts?