True.....I used the heat cycle break in on my last two engines and their both still running great. Ive got over 4 gallons on my P5x now and it still runs as good as new
I dont believe in the idle for one whole tank method, that just doesnt sound like a good idea to me.
Letting your engine run pig rich at idle for that long breaks it in all right, it probably makes it nice and loose when your done too LOL.