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As far as I am aware tyre softener in speed events are allowed, but are of very dubious advantage. One of the front running single seater drivers in hillclimbing used it last year and had some phenominal start times around 1.6 seconds for the first 64ft, but the next few corners were 'interesting' until it had worn off, so it was swings and roundabouts really. And as has been said it will shorten the tyres useable life.
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