99.5 A4 1.8T QTip hesitation and low MPG problem fixed
 

I was getting around 15 MPG, sometimes on especially hot days with A/C on trip computer would even show 13 MPG. Although never really measured mileage on a tankfull of gas, I don't think the trip reading was much off, - the car really liked to sip gas.
Also, from acceleration from a standstill was lame as it took forever for engine revs to get above 1k.

The car has a fresh set of copper spark plugs and a brand-new pre-cat OEM O2 sensor.

Solution? Cleaned the MAF using a RadioShack electronics spray cleaner. The whole thing took about 20 minutes. The car is alive now and showing 20-22 MPG in city driving.

While searching for a possible solution I have noticed that quite a few people were looking into a cause for hesitation. So, there. Hopefully, this will help some.

you might want to check this out soon b/c supposedly they are prone to go...
 

just for future reference b/c I've had similar problems but I'm still burning gas even after a MAF cleaning.
here is my temp fix....
<img src="http://pictureposter.audiworld.com/31047/hosepic1.jpg">
here is the location.
<img src="http://pictureposter.audiworld.com/31047/hosepicfinished1.jpg">

Thank you. Question though...
 

Now that you've replaced the elbow(s) is your MPG better? Not quite sure from your post.
Thanks.