All stock, and driving very conservatively, I could get 50MPG. But it required a lot more discipline than I could manage for more than about 3 tankfuls. And one romp on 200 miles worth of 50MPG and you cut into that 50 in no time. I watched it go down to 46 on one spirited pass after 200 miles at 50MPG.
Then once you mod it it any way, you won't see 50 MPG unless you sprocket it way down.