BTW - welcome to the Org!
You are also still in the break in period. Do a search here or on TDIclub to find how you should be driving. But you should be noticing an increase in fuel mileage until about 50K miles.
With 15K miles you shouldn't have an MAF problem...but who knows. Make sure you are getting the right oil in your TDI at oil changes. At this point I think you should have had 1 at 5K miles...maybe another 10K, is that right? From then on it should be 10K mile OCIs (oil change intervals).
Also, make sure your tire pressure is up. I run all 4 at 40 psi. This is a little harder than others run...but I also average 46 mpgs over the last 25K miles or so and get 700 miles on every tank.
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