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I realize this is a scooby forum but ive been told they are no good on long fast runs!!
i ahve done 5000 miles in 5/6 weeks and it has not missed a beat so far.. 04 plate with 40k miles (now 45k). always run on atleast 97 Ron. have done some sustained highspeed runs of 110-120 leptons for 60 or so miles with no major issues. then allowed to cool down by doing 50-60 for 10 miles (allowing the air to help cool down the engine bay) before i stop followed by a few minutes when get to me destination.