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What does it say in your manual?
 

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It's not me, it's you.
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My F150 is rated to use E85 or 87. We finally got a station that carries E85 so I filled up to try it out. My mpg went from 15.9 to 11.2 combined city/hwy then after two tankfuls, I switched back to 87 and my mpg's went back up but now it's hesitant to start and my check engine light keeps coming on periodically.

It might make a difference if you tune for it but I'm not gonna take another chance like that.
 

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If the stuffs anything like ethanol, it will clog your filter up fast.

---------- Post added at 09:42 PM ---------- Previous post was at 09:40 PM ----------

Sorry not ethanol. I belive stuff I ran was gasohol, that crap they had in the 80s.
 
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