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I am not sure how the mass air flow sensor got dirty at 20k ? But it obviously needed cleaning as my mileage is now averaging back up close to 50...
Poor MPG problem solved - I want to thank those of you that were posting a suggestion in different parts of the chat room, to clean out the mass...
I am having a similiar issue with my 2012 Prius C it has 25 k miles - One day at about 20k it just had less power and the mileage went from 52-55...