I have noticed a drop in fuel mileage to the tune of about 1 to 1.5 MPG combined with a slight drop in performance. No hard codes but the car feels like it’s running a little lean. I am thinking that there are some parts in need of replacement. I can temporarily improve things by cleaning the MAF, but the symptoms soon return. SO, in addition to the MAF, what else needs to be replaced? Oxygen sensors? Other sensors? Someone must have had similar experiences.

Thanks

 

have you done a full tune-up...plugs, filters, fluids (eng/tranny/diff), belts, MAF, probably a little seafoaming will help as well. gas treatment/injector cleaners. these maintenance points should help you out some, hopefully.

when i purchased my car back in March, I avg about 23 mpg. after doing these few tasks above, I am around 25mpg for the most part with mostly city driving.

last wknd I did a trip to Orlando (440 miles round trip) and got about 26.5mpg while doing about 80mph. also, this past wknd I made another trip to Fort Pierce (300 miles round trip) and avg about 25.5mpg as I was more/less around 85-90mph

i am geeting really good numbers for a vehicle this size, IMO

 

Plugs, MAF, cleaning the air intake has all been done. Cleaning the MAF makes a difference, which leads me to believe it needs to be replaced.
Thanks