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Very well could be that when the shop replaced the in-tank fuel pump they did not put a hose back on properly. Get underneath the auto.....put two jackets on and gloves....and jiggle some vapor hoses before you install that $40 valve. But again doing any of this won't increase your mileage but it might keep gas fumes out of the cabin....do u smell gas? Back to ur main issue, mileage. How bad is your mileage? My other college boy has an old Taurus that has the 6 cylinder. It gets terrible mileage but runs very smooth. However, it's a solid tank so we live with it. If your reduced mileage is significantly less than before u changed out those nasty plugs then there's an issue that a shop WILL find. The non cheap scanners have a live data feature (while the engine is running) that will pinpoint things like the air fuel ratio, spark curve etc etc. It's easy for a decent mechanic to sort out ur mileage issues. Again, you are going to have to belly up to the bar and pay a few bucks to ur favorite local garage...unless, of course, u have a nice Snap On scanner! Keep us informed!
 

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Bad sensors would throw a code that you should be able to read. The fuel pump is interesting, as a higher than normal pressure would increase fuel consumption (though that should throw a code as well as the O2 sensor would be not be able to regulate the A/F ratio which would throw a code).

If you can, check the fuel line pressure to make sure it is in the proper range.

GM made some poor coil packs (Cruze is one example) but they usually throw code when bad.
 
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