My 09 R56 S has been having some issues and been trying to work through them. Had a CEL with misfires on cyl 2&4. Swapped coil packs to trouble shoot and CEL hasn't been back on yet in 2 days. However still feeling a bit of misfire it seems. Going to hook it up to the computer this afternoon and take some data. Changed the plugs about 64k however switched back to old ones to see if that would rule out an issue, however the CEL came back on.

However, I noticed that the OBC was displaying 55mpg. As awesome as that would be I find it highly unlikely and trying to think what would cause it to read that high. Maybe engine thinks its running rich so leaning the fuel out? After filling up though it seems the actual mpgs are about the same around 27-28mpg.

It has almost 71k on it so I'm sure the intake is full of junk which could be leading to alot of the problems and will be cleaning it out soon. Just wanted to bounce it off some others to get some ideas. Thanks.