decent milege

Engine, ignition, fuel, cooling, exhaust

Moderators: Ranchero50, DuckRyder

decent milege

Postby fullauto on Tue Jul 02, 2013 10:38 am

anybody figure out how to get some decent mpgs out of one of these beasts yet ,i have a 390 in my 250 4x4 was contemplating a swap to a 300 six to see if i could get mpgs up enough to use as a daily driver . would apprecciate any input you guys might have .THANKS,Wade 8)
User avatar
fullauto
New Member
New Member
 
Posts: 8
Joined: Sun Jun 30, 2013 11:14 pm

Re: decent milege

Postby fmfdoc68 on Tue Jul 02, 2013 10:40 am

Looking forward to seeing some replies on this since my 360 F250 is getting around 8-10 MPG.
User avatar
fmfdoc68
New Member
New Member
 
Posts: 21
Joined: Wed Jun 12, 2013 9:47 am

Re: decent milege

Postby fireguywtc on Tue Jul 02, 2013 11:21 am

What are you getting now for mileage and what is your idea of decent? There are so many factors that go into mileage but my 70 with a rebuilt 390, 35s mud terrains, and a leveling kit gets 8-10 also. Using ethanol enhanced gas that seems decent to me for my old truck.
Bill
1967 F-250 LWB 2WD 352 V8, 4spd manual, true duals, 122k original miles (currently being restored)
1970 F-250 4x4 highboy ranger 390 V8, 4spd
2012 F-350 PSD FX4 LWB CC lariat, platinum white
http://www.fordification.com/galleries/ ... hp?uid=602
"If you want to judge a person's true character, give them power."
User avatar
fireguywtc
100% FORDified!
100% FORDified!
 
Posts: 3274
Joined: Thu Sep 11, 2008 7:37 pm
Location: Texas, Salado

Re: decent milege

Postby 68 Ford Stepside on Tue Jul 02, 2013 11:40 am

I love my 300 engine, but it sucks on gas mileage. 11 to 12 mpg no matter how or where I drive. I have tried multiple different carbs to no avail. I read a story about the 300 getting 30 mpg with a Carter YF carb, but haven't been able to locate one. :)


Image
"Have A Great Ford Day"
User avatar
68 Ford Stepside
Blue Oval Guru
Blue Oval Guru
 
Posts: 1154
Joined: Thu Sep 27, 2012 8:27 am
Location: South Carolina

Re: decent milege

Postby fullauto on Tue Jul 02, 2013 2:35 pm

fireguywtc wrote:What are you getting now for mileage and what is your idea of decent? There are so many factors that go into mileage but my 70 with a rebuilt 390, 35s mud terrains, and a leveling kit gets 8-10 also. Using ethanol enhanced gas that seems decent to me for my old truck.


well i drive a power stroke van that does 17 around town and about 21 on a trip so anything close to that would be decent to me.don't know what i am geting now because my truck has been sitting in the back yard for over 20 years but when i drove it i could go up a step hill kick in the four barrel and watch the gas guage go down!!! was wondering if anybody has messed with fuell injection or a more modern carb?i talked to clifford performance sometime ago and they claimed 20's were possible out of a 300 with a fuel injection setup and proper tuning.on a side note any of you guys have or seen a 250 4x4 that came with a 300 from the factory?i have owned  trucks with 300's but not 4x4 i had a 67 350 dually cab and chassis short bed length truck was awesome!!,Wade 8)
User avatar
fullauto
New Member
New Member
 
Posts: 8
Joined: Sun Jun 30, 2013 11:14 pm

Re: decent milege

Postby fullauto on Tue Jul 02, 2013 2:37 pm

68 Ford Stepside wrote:I love my 300 engine, but it sucks on gas mileage. 11 to 12 mpg no matter how or where I drive. I have tried multiple different carbs to no avail. I read a story about the 300 getting 30 mpg with a Carter YF carb, but haven't been able to locate one. :)


[ Image ]

looks pretty interesting,worth looking into,Wade 8)
User avatar
fullauto
New Member
New Member
 
Posts: 8
Joined: Sun Jun 30, 2013 11:14 pm

Re: decent milege

Postby KnockKnock on Tue Jul 02, 2013 3:24 pm

fullauto wrote:
fireguywtc wrote:What are you getting now for mileage and what is your idea of decent? There are so many factors that go into mileage but my 70 with a rebuilt 390, 35s mud terrains, and a leveling kit gets 8-10 also. Using ethanol enhanced gas that seems decent to me for my old truck.


well i drive a power stroke van that does 17 around town and about 21 on a trip so anything close to that would be decent to me.don't know what i am geting now because my truck has been sitting in the back yard for over 20 years but when i drove it i could go up a step hill kick in the four barrel and watch the gas guage go down!!! was wondering if anybody has messed with fuell injection or a more modern carb?i talked to clifford performance sometime ago and they claimed 20's were possible out of a 300 with a fuel injection setup and proper tuning.on a side note any of you guys have or seen a 250 4x4 that came with a 300 from the factory?i have owned  trucks with 300's but not 4x4 i had a 67 350 dually cab and chassis short bed length truck was awesome!!,Wade 8)


MegaSuirt is supposed to be the way to go for DIY EFI.  If I decide to get fancy I might go this route.  Along with better MPG's you can add remote start as well if you like that kinda stuff.

http://www.megasquirt.info/
A GM-convert that doesn't believe in bail-outs.
User avatar
KnockKnock
New Member
New Member
 
Posts: 77
Joined: Wed Apr 15, 2009 3:51 pm
Location: Cen. Texas

Re: decent milege

Postby colnago on Tue Jul 02, 2013 8:56 pm

With my 352 2WD, I get 10 MPG in-town, and unknown on the highway (last time I took it out, it was suffering ignition problems, so I limped home and didn't really care what kind of mileage I got).  I live in a small town, so I only have to fill up every two weeks or so.  If it were more often than that, I couldn't afford to use the old girl as a daily driver.  I think I have a sticky/burnt/bent intake valve, so maybe I'll get better mileage after rebuilding the heads.  But the FE design isn't known for good mileage, so I just sit tall and enjoy the ride.  If I stomp on the gas, she'll move, but I tend to keep my foot out of it.  I know this isn't what you're looking for, but it's a 50-year-old design, and it just can't keep up with the new engines coming out.  Different times, when gas was 29 cents a gallon (probably cheaper when the FE first came out, but 29 cents is the lowest I can remember; $3.93 is the current price in SoCal high desert).

When I got the truck, it came with an Edelbrock 1405 (manual choke) carb on a 4bbl "S" intake (1405 = manual choke and performance; 1406 = electric choke and economy).  It got 7.5 MPG in-town, and 9 MPG on the highway.  The only thing I have been able to do to give me better mileage was to rejet the Eddy; now I get 10 MPG in-town, and figure that the fifty bucks that the rejet kit cost was money well-spent.  I would not have converted from 2BBL to 4BBL myself, but since it was already done, I'm moving forward with it.

Joseph
"Sugar", my 1967 Ford F250 Camper Special 2WD, 352FE, "S" Intake with 1405 Edelbrock, Pertronix Electronic Ignition, turning a C6 Transmission (but I think she's possessed ...)
User avatar
colnago
Blue Oval Guru
Blue Oval Guru
 
Posts: 1007
Joined: Tue Jun 14, 2011 8:48 pm

Re: decent mileage

Postby HIO Silver on Tue Jul 02, 2013 9:53 pm

Three main factors working against more miles per gallon mileage: Engine/drivetrain efficiency, weight, aerodynamics

FE engines are generally inefficient but ... run a 2bbl carb (or EFI like Atomic, E-Street, Powerjection III, or Holley's new Terminator), electronic ignition with a hot spark for a complete burn, headers and a free flowing exhaust system, and port work. Tuning to maximize efficiency and A/F mixture but an EFI system with an O2 sensor can do it for you. Reduce parasitic drivetrain drag caused by wide tires, sticky tires, low tire air pressures, and heavy-bodied lubricants. Change the rear gearing to something more friendly like a 3.00 or 2.79 ratio.

Weight... these things have alot of heavy steel.. it's mostly steel! A dock bumper weighs 75 lbs.. a cast iron intake weight about 70 lbs. Lose or reduce as much as you can. Remove or leave empty auxiliary gas tanks. Compare your rig to modern trucks' plastic interiors and tailgates, aluminum tranny cases and wheels, aluminum suspension components, foam-filled bumpers with plastic fascias,  etc.

Aerodynamics... face it. These rigs are like sheets of plywood against oncoming air. ...Seal up body gaps, shave any appendages, install more aero-friendly components like 'sport' mirrors, block off the unused portion of the grill/grill inserts, add an air dam (ever really look under yer truck in relation to on-coming air? There's tons of drag and turbulence-creating parts!), bleed off engine compartment air with a reverse hood scoop or hood vents, , add an undertray, and lower the ride height. In other words, "Slick'er up".

Driving technique and speed is also important. Avoid jackrabbit starts. Anticipate stop signs and traffic signals. Be off-throttle as much as you can. Google search "hypermiling" for additional techniques. Drive no more than 60 mph. It takes significantly more energy (thus HP) as speed is increased... in fact, it's an exponential amount - not linear due to overcoming drag. I suggest researching what HP levels necessary to go 100, 200, and 300 mph at Bonneville.. it's enlightening.

My brother can get 15 hwy mpg with his  360/C6/3.25-geared 1969 F-100. I'm aiming for 20 mpg with my 70 F100... it's an experiment - a very expensive experiment but it's my goal. I've got an E-Street kit already and a TKO-500 should be arriving in the fall.

Lastly, 10 mpg at $4 per gallon is 40 cents per mile. Therefore, do the easiest and cheapest mods for more bang for the buck.
70 F100 LB 2WD, 360FE, E-Street EFI, TKO-500, 70K original miles.. follow my rebuild: The Lo-Buck Bumpside
73 F100 SB 4WD, 390FE, NP435, +4 on 35s
01 SuperCrew 4WD
01 PT Cruiser (DD)
71 Pontiac Lemans Sport Convertible, 350P, TH350, Full Hotchkis/Bilstein Suspension, 17" VN-500s
68 Mustang coupe, 200-1V, C4, Granada discs, 8-inch rear, AR Torque Thrusts
65 Mustang coupe, 289-4V, T-10, SSBC discs, 8-inch rear, Magnum 500s
User avatar
HIO Silver
Blue Oval Fanatic
Blue Oval Fanatic
 
Posts: 902
Joined: Sat Jul 23, 2011 11:31 pm
Location: Devil's Mountain, CA

Re: decent milege

Postby KnockKnock on Wed Jul 03, 2013 10:39 am

A 2-bbl will only get better MPG's than a 4-bbl if the barrels on the 2 are smaller than the primaries on the 4 (and of course you aren't always in the gas & opening the secondaries).  It's a common misconception that a big double barrel is better of fuel than a mild four barrel.  :2cents:
A GM-convert that doesn't believe in bail-outs.
User avatar
KnockKnock
New Member
New Member
 
Posts: 77
Joined: Wed Apr 15, 2009 3:51 pm
Location: Cen. Texas

Re: decent milege

Postby hotrodfeguy on Wed Jul 03, 2013 4:24 pm

A 390 c-6 can easily pull a 3.00 or even a 2.75 rear gear  :2cents:
1967 F250 4X4 352 4-SPD 4.56 PLOW
1972 F250 4X4 390 4SPD 4.10 CS HEADERS/3" DUAL/PERF-CAM/600 HOLLEY
User avatar
hotrodfeguy
Blue Oval Fan
Blue Oval Fan
 
Posts: 670
Joined: Thu May 10, 2007 4:49 pm
Location: Green Bay, Wisconsin

Re: decent milege

Postby elgemcdlf on Wed Jul 03, 2013 5:39 pm

You have a 250 4x4. Just what do you expect? I would think about the best you will see short a diesel swap will be 15mpg. You will spend quite a bit of money to get there. Higher gears will probably do the most good for the dollar spent. Your foot will do wonders as well.
User avatar
elgemcdlf
100% FORDified!
100% FORDified!
 
Posts: 1779
Joined: Mon Nov 01, 2010 2:04 pm
Location: Cincinnati, OH

Re: decent milege

Postby ToughOldFord on Wed Jul 03, 2013 10:37 pm

I've never gotten more than 9.5 out of my 390. I was close to scoring a deal that would have given me the parts to swap to a 300, but the guy wussed out.

I had a 300 in a '85 F150, never checked the mileage, but it had to be pretty good as I could go between pay checks with a fill up. Never could do that with a FE.

My truck had a 360 when I got it. It was in VERY bad tune. It got 6mpg. Got up to 8 bringing it into tune. The jump to 9.5 was going from C6 to NP435.

FWIW.
1969 F250 Ranger Camper Special. 390, NP435, 3:73s.
-------------------------------------------------------------------------------------------------
That government is best which governs least, because its people discipline themselves. -Thomas Jefferson
User avatar
ToughOldFord
100% FORDified!
100% FORDified!
 
Posts: 1750
Joined: Mon Jul 25, 2005 10:47 pm
Location: Communist California, USA

Re: decent milege

Postby Donnie on Thu Jul 04, 2013 8:39 am

HIO Silver makes the a lot of sense (cent's)   team..........slick-er up....A bit off topic but still relative.....I've removed the roof rack, installed smaller sport mirrows....extended the cover underneath another foot. It is now about 4 feet long from the front bumper.  Run a narrower tire, carry 40 # air pressure & remove the rear seat & all the xtra weight that I could find on my VW jetta diesel & if I drive like an old man, which I am :lol:  I can squeak 50 mpg out of this low grade diesel fuel.......There is only so much you can do with the shape & weight of your Bump....But Silver nailed it pretty well :thup:
Use hypermiling....coast down long hills...Install a vacuum gauge & watch it....
Some of you may be old enough to remember the " MOBILGAS ECONOMY RUN'S.....their main instrument was the vacuum gauge...Donnie
User avatar
Donnie
Blue Oval Fanatic
Blue Oval Fanatic
 
Posts: 772
Joined: Sat Jul 30, 2011 12:22 pm

Re: decent milege

Postby mcheath on Thu Jul 04, 2013 12:52 pm

My bump has a vacuum gauge, came with the truck.  It's pretty cool looking, has a patent date of 1966.  I keep my foot out of it, and try to never go below the bottom of the "driving range" when accelerating.  Rex drinks so much gas that I can't really afford to feed his habit, so I have to drive it pretty geezerly.  

Anyone ever done a propane conversion?  I know they get less MPG but propane is about half the price of gasoline here.
Vacuum gauge.jpg
You do not have the required permissions to view the files attached to this post.
User avatar
mcheath
New Member
New Member
 
Posts: 231
Joined: Fri Aug 10, 2012 12:25 am
Location: California, USA

Next

[ Previous topic | Next topic ]

Return to Engine

Who is online

Users browsing this forum: flyboy2610, Google [Bot]

Be sure to visit our sister site!