Mine - 2011 MY, June 2010 build.
About a year ago had the EGR replaced + programming but no DEF Mixer. Two weeks ago they told me I also need the DEF Mixer replaced + programming.
Mileage dropped by about 1+ mpg . . . currently ~22.5 mpg (avg. speed ~34mph). I have the 3rd row seat and Option 214 tires.
On the positive side - recent re-programming did not wipe out my programmable buttons, seat memory, etc.
Last edited by RPsX5d; 11-08-2012 at 10:48 AM.