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The first couple (2 to maybe 3) of heat cycles rock. Then, they fall off fairly linear. We usually use ours about 10 heat cycles which equates to be about one race weekend - i.e. we qualify on new rubber, race 2X and then those tires get used for practice the next weekend.
After that, there's plenty of rubber left, but they are significantly slower. Not sure about tire softening compounds, but that might help.
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