Since buying the car in 2004 I've always gotten 24-28 MPG city/highway/air on/air off. She's always be a quick start after I replaced the glow plugs in 2004. She charges down the highway as smooth as silk. A great traveling car.
The car sat idle last year while I was overseas. Since getting back home MPG has dropped to 10. No kidding, 10 MPG. I have changed all filters; air/ both fuel and oil. The car starts right up, idles nice, no smoke, no sputtering or hesitation while running or starting.
I've checked and replaced bad vacuum connections in the engine compartment. I have added diesel fuel additives in the tank, with no positive effect.
I've ordered the purge kit and will try that when it arrives.