I think it's normal for your rear tires to last as long as yours did. My rear tires on my 350z lasted about 20k. Your 350z front tires wore out quicker because of the feathering problem that earlier 350z had. I would get all season tires with a longer treadwear rating if you want your tires to last a bit longer than oem.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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