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My Story. I purchased a 2018 F150 5.0 brand new in April of 2019. I used Pennzoil Ultra 5w20 with 6K intervals and mostly Sheetz E-85 because I heard E-85 was cleaner burning than gas but I would occasionally use 93 Octane because I would get 24 mpg vs 18 mpg with E-85. From day one it would...