I am close to purchasing the Q50 Premium AWD, but would like to swap the current 17" run-flats for 19" (non) run-flat all season tires. I have read that a few US Q50 owners have done this. Has anyone done this with a Canadian Infiniti dealership? If so, were you able to negotiate a deal with the dealership directly, or, did you purchase your own tires, selling the run-flats back to the dealership, or did you have to sell the stock tires privately, or...? Apparently, from what I have heard, the stock run-flats cannot be sold as new by the dealership, given they have a few kilometers (miles) on them. Is this true? Any advice or feedback based on personal experience would be greatly appreciated. Thanks.