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I think all this discussion of camber is possibly misdirected.
OP: the tilting in (or out) is called camber. It is designed in to your vehicle, it is there for a reason. It promotes predictable handling. By itself, if it is within spec, it does not cause rapid tire wear. It is worth seeing how close it is to spec, but you should definitely still be able to see it.
What causes tire wear much more frequently is toe-in, where the tires are pigeon-toed. If you think about it, if the tires aren't pointing the same way the car is going, then the inner and outer edges of the tires have to slip with every rotation. The wider the tire, the more pronounced this problem is. You can't see a toe-in problem (because the fender is in the way) but you can see camber. That is why camber gets targetted so often, IMO.
Toe-in, combined with the camber that the vehicle is supposed to have, wears the inner edges of the tires. BMW has a rather large spec for what is acceptable for toe-in. You want it adjusted to the minimum of the accepted range. You should check that nothing is loose or worn out with respect to excessive camber, but the toe-in is what will save your next set of tires.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
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