I'm pretty sure I can feel the difference between my 135is run flats and my winter run flats, and my summer tires. I wouldn't bet big money on it.
I'm going to keep the non run flats but when they wear out, as they surely quickly will, I suspect I'll go for a run flat next time, maybe even a high performance all weather, as it gets wet here more often than one might like. Will continue with real winter tires/wheels as well.
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