The only tire's I've run out of that group are the RT615's.
I managed about 4000 km of hard driving before they were done, front and rear.
I did make it to one road course type event with them. Each run consisted of 6 consecutive laps (about one minute each). Laps one and two were slippery while the tires heated, three and four were quite nice, but by halfway through lap 5 (5 minutes or less of hard driving) they would get greasy.
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