Just to add to this, I had put 27 pounds air in my slicks in Aug for the GC, and then put them back on the shelf when I realized I coudn't make it. I had them put onto wider rims and at the same time put dishwasher soap generously onto the side walls. November I checked air pressure and the one had 25 pounds air, the other had 20. Now fast forward to now, one has 15 and the other is 21. So the dishwasher soap trick works to keep the air in the tire alot longer than without. Before overnight the airpressure in the one tire would go from 27 to 12.
If I remember right it was Geoff who told me about this at some point in our conversation.
Kevin