I get about 16-18 mpg for short trips and in and out of town.
I did a 300 mile round trip a few weeks ago, I got caught in a little traffic a few times, but in the main I was able to cruise on the motorway...I got 29.50 MPG so I was really impressed !!!

Since fitting my K&N Air filters I have notice an improvement of about 2 MPG though.