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casual driving, you won't notice crap.
I currently run fk452 (295/30R18) in the rear. Before that, I ran rs-2 (265/35R18) in the rear. rs-2 > fk452 even w/ the 30mm difference for autox for sure. Daily driving you won't notice any difference.
I can't provide any quantitative difference because I don't have any test equipment other than my butt dyno. Can't compare my autox lap times among tires because I also changed the fronts & tires were used at different events.
All said and done, if you aren't tracking your car, there is zero reason to be paying the extra price for rs-2 or z1 unless you just have money to blow.
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