Scotty, I have 2001 Lincoln navigator with a 5.4L V8 with 185k on it. My gas mileage suddenly got…

Scotty, I have 2001 Lincoln navigator with a 5.4L V8 with 185k on it. My gas mileage suddenly got terrible over the fast few weeks (dropped down to about 6 mpg!!), so after watching a few videos (including yours) I cleaned my Mass Air Flow sensor with cleaner from the auto parts store. Now I'm getting about 11 mpg (although slightly less). What I'm wondering is, if cleaning it did this much...would replacing it do more? Is it possible that a new MAFS could improve MPG closer to the 12 it's supposed to get around town? Or would that be a waste of money? I have no idea if the current MAFS is original or if it was replaced at some time in the past as I have only owned the car for about 6 months.

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