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There is one factor to determining you problem you left out, is the tire just flat or is there a hole in it? If it is just flat overnight, chances are the tire is not seating properly. If it's just flat ask them to show you the wheel before putting a new tire on the next time, it it is looks ok, smooth, no dimples, isnt bent(roll is on a flat concrete floor if it goes straight it isnt bent), or chewed up where the tire meets, ask them to use some type of bead sealer(most just use soapy water as a lubricant). After they have mounted it ask them to float it while you watch, if it has a leak you will be able to see it then.
I ran 245/40/17 on my race car and always had problems with them going flat over night, for race car tires it's a little different because you are running low air pressures but the same principles apple when trying to find out why they are going flat.
Good luck
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