I got my 1.8 TSI SC in May this year, was told the MPG would get better after the car has done a few thousand miles. For the first few thousand miles of my car my average MPG was 37. But after about 3000 miles I am now getting 31 MPG even though my engine has passed its break in period and I am driving more economical compared to when I first got the car. How has my MPG gotten worse? My tyre pressure is fine I check this every week, just not sure how my MPG isn't getting better.