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bad mpg

  1. F150 Ecoboost Chat
    I got this truck recently 2013 f150 3.5 Ecoboost 168k miles. All good on City 15.5 mpg, but recently did a trip to NC and computer told me I get 10 mpg. I just put a new air filter and new spark plugs, and i will go for a ride soon to see if anything changes. But if it was plugs or filter, the...