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'Thru' is most commonly used in the states when talking about fast-food, or any type of pick-up window that you drive up to and complete a transaction without getting out of your car. "Drive thru", you almost never see "Drive through" ... in fact, I don't recall ever seeing that.
Transversely, you rarely see 'thru' used for anything else, and when I do see it, I consider it bad grammar. The only exception might be the example given in the beginning of the thread, when saying "Monday thru Friday" for example, but even then I prefer "through". At least, that's what I always put on all of my business correspondence.
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