If its an 05 or 06 jetta, don't trust the MPG on the dish, unless you adjust the ECM with VAGcom, its reads as far as 7 mph high!
Fred's is a nice place. I been a member there before coming here. There is more knowledge at Freds then at the VW dealer.
98 Jetta TDI, (rear ended by old lady, insurance money helped buy new truck
2005 Jetta TDI. 20K and not a problem yet.