I always break in new engines with more oil. Adequate lubrication with a leaner setting so it gets up to proper temp. The crucial parts that need to break-in are the conrod journals at the wristpin and crankpin. The piston fits itself over time. After a dozen or so tanks, I'd go to my normal fuel I'd normally use for everyday running.

Just my method which I know works. Haven't had to replace a piston and liner in over 15 years and many many gallons of fuel. Just a set of bearings every 7-10 gallons or so.