460 carb milage?
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Senior User
Joined: Dec 2000
Posts: 342
Likes: 1
460 carb milage?
Does anyone have a MPG figure for a 79 F250 crewcab with 460/4.10/31.7" tires? Tac's 2825 @ 65 MPH
This is a stock engine, other than carb. It has an Edelbrock 750 CFM with electric choke. Other than maybe changing carb's, I don't want to get into the engine at this time.
My son took it back to Ft. Bragg (1400 miles) and ran about 8 MPG. I have thought about adding an overdrive unit (not transmission) which would get the axle ratio up around 3.00.
That would give about 2050 RPM @ 65 MPH.
Any input would be appreciated.
This is a stock engine, other than carb. It has an Edelbrock 750 CFM with electric choke. Other than maybe changing carb's, I don't want to get into the engine at this time.
My son took it back to Ft. Bragg (1400 miles) and ran about 8 MPG. I have thought about adding an overdrive unit (not transmission) which would get the axle ratio up around 3.00.
That would give about 2050 RPM @ 65 MPH.
Any input would be appreciated.
Fleet Mechanic
Joined: Feb 2003
Posts: 1,314
Likes: 35
460 carb milage?
I don't have first hand experience with 70's carb. 460s but from what I hear from those who do, they get less than EFI 460 engines, with the latter getting 11MPG, 12 max. So 9 , 10 mpg seems to be about right. 8 mpg is not way off.
My son took it back to Ft. Bragg (1400 miles) and ran about 8 MPG. I have thought about adding an overdrive unit (not transmission) which would get the axle ratio up around 3.00.That would give about 2050 RPM @ 65 MPH.
Interesting... how much would this cost? I too get almost 3,000 at 65mph.
My son took it back to Ft. Bragg (1400 miles) and ran about 8 MPG. I have thought about adding an overdrive unit (not transmission) which would get the axle ratio up around 3.00.That would give about 2050 RPM @ 65 MPH.
Interesting... how much would this cost? I too get almost 3,000 at 65mph.
Elder User
Joined: Nov 2002
Posts: 526
Likes: 0
From: Spokane WA
460 carb milage?
I don't normally need to take it over 55 MPH. I have 5.13 gears.
I am easy on the pedal.
I am planning on changing to 3.54s to have my RPMs down at 70MPH. I am running 31.7 tall tires now am thinking of going to 35" tires.
Greg
I am easy on the pedal.
I am planning on changing to 3.54s to have my RPMs down at 70MPH. I am running 31.7 tall tires now am thinking of going to 35" tires.
Greg
New User
Joined: Dec 2002
Posts: 8
Likes: 0
From: College Station, TX
460 carb milage?
I just drove about three hours on the highway and I got 12 mpg. My truck is a '85 f250 with a 460 and i just put a q-jet on it, but i was getting about 11 before the q-jet. No smog stuff either, 3.73 gears and 32" tires cruising at 70-75 mph.
New User
Joined: Jun 2002
Posts: 5
Likes: 0
460 carb milage?
I own a '78 F250. I changed the axle ratio from 3.55 to 4.10 to pull a large trailer and the mileage dropped from 11.5 to 8 mpg so it sounds like your truck is running OK. Based on my experience an overdrive is bound to help, although you can buy an awful lot of gas for the price of an OD!
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
460 carb milage?
Yeah, my 77 F150 460/C6 3.00 gear gets between 6&8. And I'm only turning 2200rpm@70 mph. That's with a 32" tire. I need about a 3.70 gear for sure! My Windstar turns more rpm than that and it has overdrive!!!!
Jimmy
Jimmy
