Cylinder wall wear is universally claimed to be minimal. No wet fuel to wash oil, no micro-abrasives from burned oil seep. Since oil also stays VASTLY less contaminated (no contest; the oil on my 200K+ mile 232 stays like-new up to 5000 miles) it continues to lube parts like a just-assembled motor.
Heck, if it's that clean I'd run synthetic and just change the
filter/top off every 5K or so miles. In a climate like yours where you change the filter at least yearly that should be fine -- maybe twice a year if less than 10K miles is run.
I was running up to 10K miles but it made me nervous, for no reason I can think of, and I've reverted back to 5000 - 6000 per change. I should probably just go back to 10K.