So I suggest a Top Gear challenge - simply guess the lap time the R500 will post round the track, closest wins the prize.
For all those that never venture upstairs, the R500 thread is here
If you've never seen Top Gear before, and have no idea of the lap times, the fastest was an F1 Renault at 59ish seconds, and the slowest was 2min 6sec by Richard Whiteley - pick somewhere between those two! Full times here
small print - competition closes the wednesday of the filming, any posts or edits after that time will be disallowed