BTW, rumors that Art was mongering reminded me that GX did indeed have an issue with uneven tire wear, although not flat-spotting. Apparently the shape of the cowl makes many renters to land in a slight right crab, so left tire gets worn out first. A simple workaround is to swap tires from side to side midway. Nonetheless it takes some attention to force people to seek centerline by looking at something other than cowling.
I think that's true in the Jabiru LSA, as well. It took me awhile to acquire the correct sight picture on it. We reverse the tires periodically.