I'm sorry but I don't see the relevance to cruising speed, really not trying to play devil's advocate here. A more revealing test would simply be measuring the deceleration times from say 65-45 mph when you take your foot off the gas. There's a lot more going on at highway speeds. I know when I had the 225/45/17s on my Versa it would slow a lot faster than the 195/55/15s, both being sticky UHP and Snow tires.
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