With mower racing I've learned there's really no "green" tracks. Yes, they're all different but all the same. The difference is your limits and your machine limits. With very few exceptions, mower racing has more to do with acceleration and braking and not corner speed. So I would say 98% should be known before front left tire hits outer ridge of race surface, and the other 2% exiting turn four on first lap.
In Christ, Brian Smith