I'm guessing you want to use this data to decide on a car for the 24 hour... In that case, may i recommend testing them yourself. The way i drive a car around the ring (cautiously) may be very different to how Mr X drives it (pedal to the metal) or Mr Y drives it (Metal to the gaurdrail or even Mrs Z (i'm outa ideas)
So yea, i recommend you do it yourself, or search for a thread where one person has tested some. 👍
