Originally Posted by johnlboyer

I keep reading about 50+mpg. My st TDCI is averaging around 34mpg at this time. OK it is bluefinned, and it goes very well, but mpg is low. I have had 43+mpg up to, and back from Scotland, driving at 85 mph most of the time. Does it pay to replace EGR valve or is just cleaning the existing one the way to go?. I love the car and it replaces a great ST24. I also own a 3door cossie.