Pressures for 225 width

Had a search and can't seem to find anything. Had some 225's fitted last week to replace my 215's and was wondering what pressures to run them at. Or do I stick to the factory pressures as the width change is pretty small?
 
may sound like a stupid question but i have a 197 with standard alloys - what tyre widths can I use?

215/45/17 is standard, but some people use 225/45/17 for a bit of extra tyre width - personally, sticking to the standard size seems the most logical...
 

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