as it states my 04 a4 FWD 1.8t is getting about 300km to a tank of fuel. thats really really bad, i get about 120km from the first half a tank then the rest on the other half, it goes down so fast i swear its pouring out the bottom , and i did look for that.

So far the dealer has come up with nothing but insult my intelligence. I took it to an independent place that does vw/audi and they put it on a different computer and said the sensors were within spec. At that time i was getting a bunch of lean codes and a pressure drop between turbo and DV. I found a cracked vacuum T, the one that's fed from the bottom of the intake to the leak detection pump and the evap. After being fixed the car has been code free but still has not improved.

So far i have changed the plugs, coils, the upper coolant temp, and upper O2. I ran the car with the maf unplugged for a few days under the assumption that it would reset to baseline and there was no improvement doing that either.

Other than running terrible when its cold, rough idle, stalling when stooped under hard brakeing, when the car is warm it runs like a dream.

Im at a complete loss on this, my v10 truck like gas millage is extremely frustrating.

 

i would say check again for vac leaks. Does ur mil light flash or no?

 

+1 for vac leak.

 

No lights after the first vac leak was fixed. Car has been code free for a few weeks now but still only getting about 16mpg in the city.

 

When was the last time you changed your air filter? What are your tires inflated at?
I still believe you have a small vac leak, or maybe even a bad MAF, but thats unlikely.

 

The airfilter is new tires are all about 38pounds. I need to come up with a more precise way to locate the vacuum leak. I have a bad pulley bearing right now so I have a bit more noise than I should and that makes listening for it difficult.