No science behind my logic, but here is what I do....
Recommended change (3 month or 3750) or 2 track events. So the summer meant ~4-5 changes and the winter was 1 change.
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Autobahn Country Club (North and South Tracks), Blackhawk Farms, Grattan, Gingerman, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill, VIR and "The Ring"
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