So now that my car is finally registered an I've gone through about half a tank of fuel I can give my initial findings!
Average thus far with mixed driving (mostly backroads and city, with a couple highway trips mixed in) 23.5mpg. I've been driving this thing like I stole it almost the entire time so I'm very impressed by this, driving same roads in my A4 at similar pace would have my A4 averaging ~18mpg for reference.
On one of the highway drives, It managed 34.5 MPG at ~75mph, my A4 would be sitting around 22-24mpg on that same stretch of road at comparable speeds.
The car is still very much stock, we'll see how things progress with tuning