Try to vary the revs every now and then, I did mostly motorway cruising when my Focus was new but I'd occasionly drop a gear and rev it out a bit.
Surprisingly the engine doesn't mind a few revs, I'm not sure how it behaves with an auto but it has plenty of top end grunt. The fuel economy will settle within the first 5000km too
I love the turbo whistle when you give it some, can you hear it at all in the Mondeo?