I doubt a few test drives, or one abusive moment is enough to ruin a car during break in, or there are any special rules for break in... just common sense. The over all day to day use of the car at a earlier point I think can have a positive influence on the car, or at least get you some to see if everything works right.
I've had my car almost a month, and waited until around 1150 miles to finally get on the car, wouldn't rev past 4k, or do any very aggressive driving. I babied it, let people pass me, and took the time to really get a feel for the clutch, do mostly driving in traffic, cruising around, and familiarizing myself with the feel of the car...
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