Phil,
These are encouraging numbers. Are numbers from the regional level compiled? I run in the MARRS series and we averaged 7.4 FC cars over the season. Three of our events were combined with CCR and Glen races each having an overall higher FC count, inclusive of non-MARRS competitors. FF averaged 2.7 cars per event. FM was a non-factor with only an occasional car running. FV averaged 13.5 cars per event.