I also am getting pretty bad gas milage. i just recently bought a 2011 wrx and it came with a tbe, sri, header, and had an open source tune through my cobb ap . according to the readout on the dash im getting 23.5 all city. but on the accessport the log is only telling me 21.7. however if i do the math i should be getting closer to 300/tank even with 21.7 mpg x 16.9 gal/tank. im at just over half a tank and im at 100 miles driven. im still getting a feel for the car so im not romping on it, shifts are under 2750 rpm. idk what im doing wrong or if its just to be expected.