Hank, I was able to get about 7 seasons on the last set of ws15 blizzaks I ran on my old z28. I usually wait until the very last minute to put snow tires on. Because once they're on, I drive the car like gramma. Gentle acceleration, braking, taking it *VERY* easy on the curves.
I already have new snow boots for the G37 (xice2 in same size as yours), but haven't mounted them yet. Forecast shows mid/upper 30's at least for the next week in the chicago area, and unless temps are closer to freezing, I'm ok with running the re050's (albeit gently until they're warmed up some).
When temps start to regularly reach up 30's or higher, the summer tires go back on - around here usually mid/late march.
Ymmv (literally)... Btw, the xice2's come with a 30K warranty
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