Don't worry, this seems to be a common fault, certainly with 2.0. I've had mine 4 years and it's always done it, but it doesn't use any water at all which is a good sign.
It will be made worse by short journeys.
One thing you should do is to clean out the filler cap and breather pipes as they will block up over time.
Take of the filler cap, then remove the filler neck, it twists and pulls up. Take off the two breather pipes and wash the whole lot out in paraffin. You'll be amazed how much crap comes out.