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@PhilPub
I used to be partially persuaded by the "500 miles per pair" idea, but there probably is an element of manufacturers/shoe shops trying to get you in new shoes before you need them. (The same people telling you to take gels every 20 minutes.) These days if the shoes aren't causing me any problems and there is enough outsole I carry on. I've got over 1,500 miles out of a pair of Brooks Defyance before the sole wore through to the midsole foam, although strangely my latest pair (same shoe apart from earlier model) have got to the same state in 1,200 miles.
I think it can vary hugely according to weight, running style, etc. Someone who is prone to plantar fasciitis might want to renew their shoes before they feel the cushioning becoming less springy. Other people run racing flats for everyday training into the ground without any problems.