Has anyone used this product before? What results did you get? My MPG is very low - 31mpg, even on an extended run to Scotland and back (I had to fill up three times as much as my BIL in a Sharan 2.0TDi) and having read threads on this forum, I am beginning to suspect my EGR could use some cleaning. I posted in an earlier thread about the challenges I am having with removing it from the engine as the guide shows. This cleaner seems to be suggested as a cheaper and easier alternative, but I would like some advise before I use it. Thanks.