I have a 2004 Chevrolet Impala. The Driver Information Center (DIC) is very innacurate. GM says that it is calibrated correctly but it is off by about
5 miles per gallon.Does anybody else have this problem? Any suggestions? Has GM put out any tsb's to address this problem. I have had the (DIC) on a buick and a cadillac and both were spot on. I can't believe the Impala's DIC could be so innacurate?
help?!