I've only had the car about a week and a half so I'm still learning what the "usual suspects" are...
My new owner list of things to do includes: Running a Diesel purge, replacing the fuel filter and doing an oil and other fluid changes. I have one bad glow plug which is causing some poor performance in one cylinder. The injector may be carboned up and spraying poorly. I'd really like to get into that prechamber and inspect it's condition and the condition of the injector nozzle. I'm sure this is contributing to the poorer mileage. I'm kinda scared of the special tool list for injector and pre-chamber removal though...
BTW, the car has 136,000 miles and it's getting 24 MPG combo city/hwy and 29 on the hwy only.
Thanks!