Any advice for a virgin..

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a trackday one that is.
i'm intending to do one in august and was wondering what advice your'd give.

do i need to prep the car?

are there any ordinary cars at these trackdays? only ever see photos of elises, scoobys, race cars etc

How quickly do you go through petrol, would half a tank do, for example

do people treat it like a gp qualifying run, or are people keeping it fairly steady, guess it depends on the organisers?

any advice would be grateful.