I don't remember the conditions being different... But I don't remember much these days! If you look at the individual times from Sat. to Sun., you will see that some people were much faster on the PRO course and some people didn't pickup any time at all. Look at the ITA group 3. Compare each driver's times from both days and take from that what you will.
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I'd say that for us (group 2), the track was better on Sun vs. Sat. Maybe the track got better as the day passed on Sat. I only looked at the fast guys since their performance is likely to be the most consistent.

Ed.