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Actually, Nike makes a couple of different "sleeves". I know the one y'all are complaining about...that's the newer one. Earlier in the year they were selling one (I bought a couple) that enables you to see the display. I tried to find a link on the Apple site for you, but it doesn't seem to be there. If there's an Apple store in your area, check to see if they still have it in stock. It's superior to the "new" version.
BTW...the reason that you're getting differing readings on a treadmill vs. the track is that you're not actually running as far on the treadmill. The distance shown on the treadmill display is based on the number of revolutions that the rollers are making and the length of the belt. When running on a treadmill, you're actually introducing a vertical component to your motion that's not there when running on solid ground. That robs you of some horizontal motion. Think about it...you could "run" on a treadmill simply by hopping up and down with a very small horizontal component (just enough to stay in place). The belt would move under your feet...and indicate a distance much greater than you'd actually run. Treads are OK if you're just trying to maintain some cardiovascular conditioning, as you're able to maintain an elevated HR for a period of time. But as a method to train for an actual road race...not so much.
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