I believe that "endless breakin's" with gallons of fuel is a waste of time and money. I simply run a couple tank fulls through the engine to get it dial in. Leave it just a tad rich and fly the darn thing. Everybody has their own way. Mine works for me and all my engines run just fine.

Adding fuel to the fire here in that just because and engine has been broken in for 6 months on a test stand and 20 gallons of fuel does not mean it will run any better than mine if a person cannot properly tune it. I fly at a public field and there is a very healthy percentage of pilots who "think" there engine is straight vs those of us whose engines are.