Interesting.. I wonder why a leak such as this would be permissible at all, unless it were by design for enrichment. Anyway, the fuel mileage is 19-21MPG City and 26-28 MPG HWY. If it were leaking enough to cause a problem, would my MPG figures be much lower? I figured the leak was to blame for my rough idle and sputtering hesitation while accelerating from a standstill (due to fuel loading up in the cylinders), as I've already changed all ignition components other than the coil. Injectors an fuel filter have been replaced and I've also changed the lambda sensor as well.