Adjusted my timing and pump delivery yesterday...

[Patrick]

Just checked my mileage (92 jetta 4 door w/1.9TD) works out to 6.1l/100 km or about 46mpg imperial. Not impressed! Checked it about three months ago, presumably winter fuel then, and got about 49 mpg that time! most driving is 2 lane at 90 to 100 kph, should be better than that! As with the other guys, running the max air pressure on the sidewalls .maybe the 195/60 15's are too hard to push? Diameter of the tire appears to be pretty close to the 185/65 14's on hte wife's Jetta..........

[shox75]

My needle hit 1/4 on the guage and i only did 200kms so far. From here it drops faster because the guage increments arent very acurrate.
Going to check for brake drag today, but i highly doubt that because i have rear discs and they were just done 2 months ago.
Thermostat was replaced with enigne rebuild 4 months ago, although its an aftermarket one as a recall.
Is there anyway to tell if the thermostat is stuck open from the temp. guage in the car?
Mine always warms up till its about half way, and then stays there.

[chrissev]

My needle hit 1/4 on the guage and i only did 200kms so far. From here it drops faster because the guage increments arent very acurrate.
Going to check for brake drag today, but i highly doubt that because i have rear discs and they were just done 2 months ago.
Thermostat was replaced with enigne rebuild 4 months ago, although its an aftermarket one as a recall.
Is there anyway to tell if the thermostat is stuck open from the temp. guage in the car?
Mine always warms up till its about half way, and then stays there.

My temp gauge does the same.  Half way up and then stabilizes there.  It's weird that your mileage is so low after the rebuild, because the pump is mechanical and the fuel is metered per the pump and not per the engine (ie, the pump is designed with the assumption that everything in the engine will always be the same at a certain rpm, with the exception of the boost enrich for the turbo which enriches the fuel supply depending on how much boost you are putting in).  That is the only variable that is controlled by something happening outside of the pump.  So mpg issues on those cars are usually caused by either something slowing down the car so that you have to put your foot down more to get it to move, or something on the pump or to do with the pump adjusted wrong so that the fuel supply is inaccurate or the delivery is at the wrong time.  
If you turn the crank by hand with a ratchet and socket, does it turn freely up to TDC where you feel resistance from the compression, then when you go past TDC does it release and turn freely up to TDC again?  There shouldn't be any resistance other than the resistance from the compression.