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Never owned one, but know folks who have or do. I've heard from 8 to 16. Expect around 12, give or take a couple. Not much for fuel mileage, but those 390s will about pull your house. If fuel mileage is more important then power, buy an older truck with a 6 cylinder. My old Ford f100 gets 18 or so with a 240 6. Won't hardly climb a mountain pass in fourth gear empty though. And the roads around here are all 50 or 60 MPH, that helps MPGs, these older trucks weren't designed to do 70+ and higher speed will take a toll on fuel mileage.

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Q: What mpg will a ford 390 get in a 77 f-250?
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