I'M a happier owner of an 05'coupe 6MT.been checking my mileage religously and the best i been able to squeeze out of her was 25.8 MPG @70MPH this is w/bone stock w/M-1syn. & M-1 filter on 20"Axis. I installed my Z-Tube/drop in K&N today and took a little trip down I-10 about 90miles.stoppped and refueled and to my amazement received 30MPG!! I know,i'm not going to get to happy until i see this over time,but it did put a smile on my face and hers!!