For those with 460's.....
Postmaster
Joined: Jul 2003
Posts: 2,544
Likes: 2
From: okc
my stock 460 with a 780cfm holley vacuum secondary got 12-14 mpg if i kept my foot out of it, lately ive only been getting 8-10 because its overdue for some top end work.Before the valvetrain went downhill on me, 12-14mpg wasnt hard to achieve at all, even hauling a 16' trailor with a ditchwitch,2 1000' rolls of conduit, 28' ladder and a bunch of tools i could still get 12mpg. If anyone is getting less than 10mpg from their 460 they need a carb rebuild or their timing checked, or like me-need the top end reworked.....of course those numbers go down drasticaly if you like passing every chevy out there!!Which i do alot of the time, and thats why i need topend work as well...
Postmaster
Joined: Mar 2001
Posts: 4,968
Likes: 3
From: So Cal
Depends what year etc.
My 94 F250 supercab long bed E4OD 4x4 4.10 gets about 10-11mpg almost regardless how I drive. On a good day if I say my prayers, I might get 12mpg. Towing my 8,000# trailer I get 8-9mpg on flats and I have seen as bad as about 5-6mpg in nasty hills.
From what I have read most of the guys with EFI get between 9 and 12mpg. The carb'd guys get less.
Good Luck,
Jim Henderson
My 94 F250 supercab long bed E4OD 4x4 4.10 gets about 10-11mpg almost regardless how I drive. On a good day if I say my prayers, I might get 12mpg. Towing my 8,000# trailer I get 8-9mpg on flats and I have seen as bad as about 5-6mpg in nasty hills.
From what I have read most of the guys with EFI get between 9 and 12mpg. The carb'd guys get less.
Good Luck,
Jim Henderson
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
Likes: 14
From: West Cornwall, CT
'95 F-250 HD with EFI - 12 MPG unloaded, 12.5 with a tailwind, 6-8 MPG when towing a 10K trailer.
As others have mentioned, it is *very* easy to get lower numbers if you stomp on it.
Lou Braun
As others have mentioned, it is *very* easy to get lower numbers if you stomp on it.
Lou Braun
Junior User
Joined: Jan 2005
Posts: 76
Likes: 2
My 88 F-250 with fuel Injection gets about 9-10 average. Lowest was 6 when pulling a trailer 75 mph on freeway, best was 12 when cruising about 55 on freeway.
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Mountain Pass
Joined: Jan 2005
Posts: 124
Likes: 2
I get 8-9 pretty much all the time, empty or loaded. I pull a 8000 Lb 26' Box trailer. I'm using a Carter AFB
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Tuned
Joined: Feb 2004
Posts: 330
Likes: 0
From: Missouri
I have an 84 F-240 4x4 hd ie. lots of weight empty almost 6000lbs farm truck motor with almost 200,000 miles on it and eats quart a week of oil it gets 8 mpg empty, 6mpg fully loaded 10,000lbs gravel driving off the scales
Senior User
Joined: Jan 2004
Posts: 307
Likes: 1
From: Perry Michigan
Gas Mileage???
The numbers that you guys are posting are crappy! I have an F250 with the 460, a 4 speed and 38's. The truck actually runs like crap but I towed a car down the highway doing about 70-75 mph and I got 12 mpg. My average gas mileage day to day is about the same. maybe i shouldnt tune it up, my mileage might get worse!!!!!
Junior User
Joined: Feb 2005
Posts: 96
Likes: 0
I've got a 93.5 FI 7.5 CC LWB 4X4, always got 13-15 mpg highway, light trailer, loaded,empty until I put 35s on it last year. I probably dropped 2mpg. She's been great, though, very reliable. I'm getting a diesel now, just hope it's as reliable!
Junior User
Joined: Jun 2003
Posts: 83
Likes: 0
From: Rome, Italy
Vaccum lines on a 460?
I have my newly built 84 F250 4X4 (used to be a 2x4), up and running now but I have a few questions. When I bought the truck in Az in was in pretty bad shape, it still ran, or should I say limped along but it needed some TLC. I have finally got most of it straight, but I am wondering... My fuel tanks have breather valves, ( like I see in the manuals for a vaccum canister) and a vaccum set-up. Problem is ever since I have had the truck it has only had about 4 vaccum lines, one to the auto tranny (its now gone since I have a manual) and and one from the heater motor, plus the Manifold vaccum and temperature on the front of the engine... Should there be more? Its an 84 and it says non-catalytic, so no CAT either. I'm just trying to figure this all out.
