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I have driven the M/T Sportsman SR skinnies (6" width) on the street, not 2.5 hours though, but around an hour each way. IMO they were fine just going to the track and back, but of course, I took it easy in the corners. I knew that the overall handling/stopping of the car was compromised by the skinnies, and treated it as such.
The possible issue that I see with the ET Street Front for driving to/from the track for 2.5 hrs each way is the lack of real tread. The ET-R which you have for the rear has the same problem (only straight grooves, no exit cuts). I had that same exact tire (305/45-17 ET-R) and I got away with it once when the rain stopped and the roads were only damp for the drive home. However on a later trip to the strip, it ended up raining for real after the first run, and continued raining, and the ET-R was just horrible on the way home. I ended up swapping to the S/S tire, because it had (sort-of) real tread.
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