Dear Doug;
The used tire thing probably isn’t a good idea at CRE due to the abrasive nature of the track. Your talking about qualifying, 2 or 3 heat races, and a final event. I personally don’t think that a set of used MG tires would be safe come the final event. We’ve ran the Bridgestone YGK tires down there and they wouldn’t make it that far, at least the fronts wouldn’t.
Just a thought if your talking about using used tires and are going to allow only one set to be used all day.
Tim George