QUOTE(kadajawi @ Mar 31 2013, 12:42 AM)
Normally inside and outside is defined on the tyres... Also there shouldn't really be different wear... unless you have too much chamber or something is wrong with the car... or you are a NASCAR driver.
Some people say not to swap left right, and turning them around sounds like a bad idea. It costs money, I didn't ever notice a difference in wear from one side to another, and it may have handling disadvantages. So... not really worth it IMHO.
That's if you're using asymmetric tires, then you cannot switch the tire/rims orientation but you can rotate left/right immediately. If directional symmetric tires, then there's no inside/outside so you can switch the sides, but for directional you need to change the tire/rim orientation to switch left/right.
As for the camber, cars which are running around 1-1.5 degrees will usually wear out the inner side just a bit more, will be a bit noticeable after around 10-20k km usage.
It's true that it might not be much difference between left/right and should not be if normal, but it's actually recommended to still rotate left-right if possible to really even out the wear. There won't be handling disadvantages. As for the cost, well when using non-directional tires I used to rotate myself for all 4 corners, so zero cost, just a little sweat which I take as extra work out!

. If directional, then of course have to bring to tire shop, but then don't need to do it so often la. If want to save, can just do it every 15/20K km. The only other additional cost is a wheel realignment might be necessary but usually not.