I'm not real happy with my ScanGauge right now. After 225 miles of a 250 mile trip yesterday , the instant MPG started to read 9999 ALL the time , except during acceleration when it appeared to display correctly. The last 25 miles (separate trip) was on a road that should have netted about 48 MPG , but TRIP showed 409 MPG when I got home ! While I would love to believe that , I'm suspecting that My SGII has some issues. TRIP MPG for the day read 52.X. I also want to believe that, but it may be closer to 49-50. My question now is : how long is the warranty ? It was purchased last August , I think.