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If you have an automatic you can easily use cruise control and still vary the engine load at highway speeds since both 5th and 6th gear are under 4000RPM well north of 80mph. (Set it to manual mode and shift back and forth every few minutes.)
Pull off and back on the highway every 20-30 minutes if you want to be extra careful.
There's a lot of conflicting advice on break-in: I'd say just read a little and decide for yourself how safe is "safe enough" in your book. I put the alarm at 3900 for the first 500 miles, raised it to 4900 until 750 miles, and then 5900rpm until 1000 miles.
Then it was "I paid for the whole tachometer, I'm going to use the whole tachometer".
Ultimately, do it the way that makes sense to you. I knew I'd go nuts trying to stay under 4k for the full thousand miles and, like Yoshoobaroo said, most of the critical wear in happens early on.
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