When i went up to Mountune MP260 the MPG was slightly better, also the Engine went better as well, very noticable, when overtalking, but when i went further up to MP290, I lost what little i had gained on the 260,but the Engine Rev`s better under load, or pull`s away loads better.
i also changed the Dash Leds from the daft... dull white, which was all common in1950, to 1975, to modern looking Blue, i left the Computer Red as it was, same idea as VW.
So my MPG is back to almost square 1, not any worse, 290 is a better Set up for me, as im located in the Remote Highlands of Scotland, where its very Hilly, no Motorway, so the MP290 shoots up the Mountain Roads better than before.
So, i found, a bit of Tunning is fine, its the way forward.. not a problem..
all the best for 2013
haven't paid attention to mine had the car 3 months and still driving it like I just brought it, cant help it makes me smile everytime must be the Bluefin stage 2 and turbo back lol I blame the pops and bangs brings the child out in me