This started off as a proper test as I had read in various places that you can shoot XP2 at different ISO ratings without changing the development times.
My plan was to load up my FE2 and over the space of a few days/weeks shoot the roll in different situations that required possible pushing/pulling and write down the setting to see what happens when I develop the roll eg. does it work??
The experiment went pretty good initially but about 20 frames into the roll I managed to lose my little notepad with my settings on which essentially ballsed up the whole thing as I do not have the settings to correspond to the images.
What I can say is that I shot the roll between 200-3200 iso … the shots in the bright sunshine were at the end of the roll after I realised I had lost my notepad so I think they were all 200-400 while the shot of my son on his phone was definitely at 1600 iso.
All in all after a little tweaking in Lightroom every frame I shot was perfectly useable with the higher ISO shots exhibiting quite a bit of grain but I like grain so to me that was an added bonus.
Well here is a selection of images … comments most welcome …
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All images on my blog are available as prints just drop me an email
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tim dobbs photography 
very interesting experiment. i tried already something like this but only one stop of ISO so its nothing. the only thing i miss here is your developing process info please.
Hi Victor … I developed the roll for the standard times for C-41 which in this case was 8 minutes @ 30 degrees using the Tetenal kit.