I pulled the top end off yesterday, investigating a noise I had started hearing, (turned out that I need a little more pop up clearance). So, I mic'd the pistons and cylinders.
As near as I can determine, bore wear from top of cylinder to unworn bottom is about 1/2 thou, both front and rear cylinders. Total piston to cylinder clearance is 3 thou, with original setup clearance being 2 thou, for a total wear of one thou overall. This is after Ten Thousand miles. This included several weekend road trips of 7-800 miles. These comprised about half thruway/interstate cruising. I'd ride to Rhinebeck then go on afterward to visit my son in Mass. Then, burn on back on the return trip via the Thruway.
I'm completely satisfied in my mind that the sporty pump/piston squirters, and perhaps the filter being in the engine feed line, are responsible for this improvement in longevity.
I just thought it was newsworthy and you all might like to know,