Drive it at various RPMs and apply varying amounts of power. When pulling away from a stop, sometimes give it 50% throttle, some times 75% and occationally wide open throttle (for a few seconds, at least). It's important to mix it up a bit. Multiple trips with cool downs in between may help, too.
This would be better than a long trip at one steady speed for instance. You won't be abusing the motor at all to give 'er the gas.
Modern engines are built with tolerances close to ideal and don't need extended break-in time to "wear in " the moving parts.
Think of it as learning your car and testing it out. You need to be broken in to the car as much as the other way around. Have fun.
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