just bought my first subaru (and first new car), 05 outback xt ltd, black, with STS and 500 miles... one agent at the dealer told me its better to push the engine more during break-in (as long as you dont use cruise or keep steady rpms) to gain even better production long term. (explanation was because of more precise machining in modern cars)

 

any other opinions on this? its difficult not to let the turbo kick in and take you over 4000...

Until the internals of the engine get settled into themselves I would read the manual and follow it for break-in recommendations.