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The most important part of a break in is varying the load on the powertrain. Definitely do not use the cruise control on the return drive, and vary your speed frequently even if it annoys traffic around you.
When I got mine, I had a long drive ahead of me a couple of days later, so I took back roads through several small towns to vary up the RPM and power demands and avoid the temptation to cruise at a set engine speed. It significantly lengthened the drive, but it was worth it for a proper break in.
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