Howick, Stop using shell V-Power. The ECU isn't mapped for it and the car runs too rich on it.
Go back to normal but good unleaded (shell, BP) and you will find your MPG will go back up in a couple of weeks.
Also, make sure you arent getting hot air sucked into your K&N as that doesn't help.
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />