vacuum sensors

Maybe not the only reason, but a sure bet would be to start with any codes being thrown.
 
I had a DPFE sensor code, and when I replaced mine, the fuel mileage came back big time.

Mine wasn't getting 15 mpg though, YMMV.:)
 
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psychostang said:
Differential
Pressure
Feedback
Exhaust
Click to expand...

Little more than that. :)

Differential Pressure Feedback Exhaust Gas Recirculation Sensor. Tit for tat man I know. Lol
 
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