Front tyres were fine (32psi), rear were only 30psi so pumped them to 38psi, MAP was filthy so cleaned it with brake cleaner and air filter was black!! Now replaced. I'm in the the middle of the new mpg check so will post back here with the results. Thanks

Right! Just finished an mpg check after the above and I'm now getting 24.4 mpg as opposed to 20!! I'm not sure if it was one thing or a combination of all but it is more like what it should be I think?
Thanks everyone
 
Hi Sulli I did all the following:
egr out
de cat pipe in
sports air filter
new genuine maf
cleaned map
HD torque converter
Dynachip remap
front 22psi rear 28psi (I run like this cause I hate the harsh ride on 18" wheels with the psi at normal)

figure I getting 25mph urban with a fairly heavy foot.
 

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