I've been looking at buying a GTO for over a year now. I couldn't take it anymore so I went to the dealer to give one a test-drive and came home with a black-on-black 06 M6 that had only 3 miles on it:cheers . I put about a hundred miles on it today and have already gone through 1/2 tank of gas. Does anyone have any recommendations for breaking in the engine? So far I've tried to keep it under 3K RPM, but I haven't finished reading the owners manual, so I don't know what the manufacturer recommends.