My understanding is that all new engines nowadays are run up and bench tested before being shipped. So I would expect the Ford GDI to go through the same process even when supplied to 3rd party. Materials and build quality are much better nowadays. If you think about it if it was in a Ford you would just drive it.
The main thing is not to labour the engine, in other words be in too low a gear when on hills or at low speeds. I would say how you've been driving is fine. And 70 at 3k rpm is not going do any harm, and even 4k rpm will be fine. I am a firm believer of an early oil and filter change, at 3k miles or at least 5k miles, it will help prolong the engine life. Once you get to around 3k miles I would start to Rev the engine a bit more, now and again and then it will start to free up naturally. So the odd spurt in a higher gear when overtaking or want a burst of speed. Bumbling about forever will just leave the engine tight. I would even consider changing the oil again at 6k miles.
