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While the best way to break in a new (or rebuilt) motor is open to much debate there's near universal agreement on a coupe things you DON'T want to do:
1) Lugging the the motor in too high of gear.
For instance, at 15 MPH, it's better to rev it a bit (~3,000RPM in 1st, or ~2,000RPM in 2nd) than to lug it in a high of gear (1,000 RPM in 5th!). Obviously this pertains to cars with manuals and is good advice post break-in as well. Lugging a motor can put more stress on the engine and drivetrain than running it at the red line (which of course should be avoided also on a brand new engine).
2) Cruise/drive long distance at the same speed, RPM and gear.
I live in North Texas and have bought new vehicles in Oklahoma and Houston. DFW is a straight shot up I-45 from Houston so driving home I'd vary speed and gears on the highway and take about every other offramp which allowed me run down through the gears, make a complete stop (helps bed the brake pads in properly), and then run back up through the gears as I accelerated and re-merge onto the Interstate.
When driving back from Oklahoma I took curvy and lightly traveled backroads which allow varying RPM and working the gears and brakes without having to come to a complete stop. When I had to get back on the Interstate for the last 70 miles I took alternate exit ramps as above.
The main thing you don' want to do if buying a car far from a dealership hours from home is get on the Interstate, set the cruise control, and drive for several hours at the same speed and RPMs.
On the other hand, if traffic is heavy and stop & go varying the speed and RPMs will pretty much take care of itself.
Good luck!
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