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My 2006 F-150 with the 5.4 triton engine has around 170,000 miles on her. I’ve done all the routine maintenance myself, but haven’t changed any major parts or sensors since owning her, other than routinely changing the spark plugs and brakes. I also have recently change my fuel filter and air filter. I bought the truck with 90,000 miles 11 years ago.

Recently, I went from averaging 14-15 city mpg with a powerful acceleration with rpms around 1300-1500 to a sudden drop to around 9-11 city mpg, and sluggish acceleration where I’m finding myself having to push well above 2,000-2300 rpms just to get up to speed.

I have no CEL, no underlying codes when I connect my scanner, all my fluids are good with no indication of one leaking into the other, I’m not burning oil. I’m thinking either a sensor is going bad but hasn’t gone “bad enough” to throw a code, the fuel pump/sending unit, or fuel injectors. But for all 8 injectors to go bad at once seems far fetched since my idle is fine.

Has anyone else encountered this or have any suggestions on where to begin or troubleshoot this issue?
 

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Possibly, but they would also be noisy and you could/should hear it. I own an '05 5.4 that my son-in-law drives. The phasers are getting noisy, however, performance has not changed. But if one sticks it would cause the problems you mentioned.
 
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