So, I fixed everything aside from the boost hiss, and the car performs much better and the CEL is gone. But my gas mileage is complete trash. I'm at 240 miles when the gauge reaches the last quarter, which is ridiculous, because I used to get 325 by this point. I'm spending an extra 10 per gas fillup for 93 Octane due to the tune, so filling up more often is really not going to work. What should I be looking for that would cause such a drastic drop in mpg? I always get about 115 on the first quarter then it just tanks.