Never run flat out on new tyres fitted to your car. Tyre dies are coated in a release agent to ease the release of tyres when they are ready & that is what gives the new tyres their sheen. This also means that the tyres are not performing to their optimum level till the release agent gets wiped off.
Best thing is to drive you can sedately for about 100-150kms when you have fitted new tyres. Also before driving fast on new tyres ensure that they have gone throught atleast 2-3 heat cycles. Heat cycles mean that the tyre should heat up to its optimum temprature (which should easily happen if you drive for 5-8kms constantly) and then cooled down once you've come to an extended stop.
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