Asked in Ford F-250Fuel Economy and Mileage
Ford F-250
Fuel Economy and Mileage
What mpg will a ford 390 get in a 77 f-250?
Answer

Wiki User
September 22, 2012 7:19PM
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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Where can you get a vacuum hose diagram for a 1977 Ford F250?

my 77 f250 351m passed smog with flying colors. i started with a
truck that had been stripped of all smog components i used the vac
diagram from a 77 f100 auto trans even though mine is a manual
trans because of its simplicity. try to get the diagram your smog
shop has. if they dont have one or dont have a good one then use
this one. the shop manager at a very old ford dealer told me that
if the smog guy cant prove you wrong then you are right. i have
this diagram and am happy to share it because it was shared with me
and was a great help.