You are being a little unfair on the engine - as it has only done 1.5K, it's still tighter than a nuns' chuff. Check your figures again at 5k and 10k.
And yeah, you will probably NEVER achieve the stated milage, for the reasons already stated.
Ah well, at least take comfort in the fact that the MP3 playback is perfect on these cars!!
Mine's done nearly 5k now and I'm averaging 45 mpg so I don't think it'll be long before I get the magic 47 mpg.
Like I've said before it takes about 10k before the engine's fully loosened up so be patient guys......it will happen!