I have a 98 Windstar with the 3.8 (no antifreeze in the crankcase, thank goodness!) and 94K miles. The gas mileage has taken a nosedive of late - overall mixed driving is returning less than 14 mpg. EPA estimates are 17 &
24 for this vehicle, and that's about what it used to get.I just replace all six spark plugs & wires hoping that would help - put in OEM Motorcraft plugs, AZ wires - since it had been running less than smooth. It purrs like a kitten now, but mileage has not improved. I know that swapping plugs was a long shot, but figured it wouldn't hurt. My wife normally drives this, and I'm not sure how lead-footed she is. The tire pressure is good and I replaced that original steel wheels with aluminum last summer and I think they are lighter, though I may be mistaken. Otherwise, what else should I look for?
Thanks
G