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The modern car engines are designed to gradually run in, reaching optimal performance/efficiency at around 25,000 miles. Most engine experts say drive it moderately (not babying it, but not WOT either) and varying RPM/load for about 500 miles. I don't know if "rushing" the run in by driving aggressively right away would affect the longevity but I do think it's better than babying it the whole time. Most owners don't keep these cars past 25,000 miles so this may be a moot point.
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