Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Post to end my other posts

I've been having the same problem recently. I've been averaging 20mpg mixed city/highway driving. Within the past 4 months the plugs have been changed, the UIM and LIM were taken off and cleaned very well. I too have recently reinstalled my stock airbox and at that time cleaned the MAF and IAT sensors. I also checked all the plugs for a gapping issue without finding one. I am now trying different brands and grads of gas from 91 to 94 hoping that it is a fuel issue. For reference the car only has 50,000Km on it and in the spring was easily getting 25-30mpg. For me the problem has been persisting since mid summer.