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04-04-2008, 11:26 PM
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#1 |
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Junior Member
Join Date: Sep 2007
Location: Brenham,TX
Posts: 571
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6 cyl MPG
How Many MPG does a 250 6 cyl get. and How much less with 4-BBL INTAKE MANIFOLD?
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04-05-2008, 12:00 AM
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#2 |
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Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: 6 cyl MPG
I'd venture to say anywhere from 8-15 with stock or 4 barrel intake. Too many variables to really nail it down. What kind of 4 barrel are you using? If it is a q-jet, your not going to harldly even open up the secondaries with a worn out 250.
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Bill BEATERS ARE NEATER |
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04-05-2008, 12:34 AM
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#3 |
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Active Member
 
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 6 cyl MPG
I just got my 68 GMC road worthy again week before last. Filled it up and drove it mostly on the highway between 55 and 60 mph. I was surprised that I got 18 mpg on it. I was expecting aroun 14-15 like my 69 Chevy used to get.
Here are the truck's stats: No A/C, 250 six bored .030 over with a 3 speed saginaw and 3.73 rear end, 235/75R/15 tires. I put a rebuilt single barrel Rochester manual choke carb, new style solid state voltage regulator. It has plenty of zip for what I need it for and I'll be checking mpg on it for a while to see if it's going to vary much. |
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04-05-2008, 03:05 AM
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#4 |
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Junior Member
Join Date: Sep 2007
Location: Brenham,TX
Posts: 571
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Re: 6 cyl MPG
anyone?
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04-05-2008, 06:53 AM
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#5 |
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Registered User
Join Date: Jan 2007
Location: Denton, Texas
Posts: 356
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Re: 6 cyl MPG
I have a 292 with a one barrel Rochester Monojet carb and a granny low four-speed, with very low gears in the rear end(4.56 or something). Last time I filled up I got 10.8.
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Andrew '69 C-20(292, 4-speed) Retired Daily Driver '64 C-10(250, 3-speed) Fixerupper '97 F*rd Mustang GT(4.6L, 5-speed) Daily Driver If I only wanted two pedals I'd have bought a bicycle.
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04-05-2008, 07:25 AM
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#6 |
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Registered User
Join Date: Mar 2004
Location: Hoytsville, Utah
Posts: 3,365
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Re: 6 cyl MPG
Nobody ever believes me, but get around 20 in my Panel. But it has a 230 and a 1 BBL. I'll miss that milage when I change to a bigger motor.
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'68 Panel Project Boogie Chillin' '68 C-10 Ol' Green |
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04-07-2008, 01:20 AM
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#7 | |
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Junior Member
Join Date: May 2006
Location: W-S, NC
Posts: 211
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Re: 6 cyl MPG
Quote:
maybe a bit less 
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Have fun, Don |
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04-05-2008, 07:29 AM
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#8 |
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Registered User
Join Date: Jan 2007
Location: Denton, Texas
Posts: 356
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Re: 6 cyl MPG
Wow, what transmission and gears do you have?
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Andrew '69 C-20(292, 4-speed) Retired Daily Driver '64 C-10(250, 3-speed) Fixerupper '97 F*rd Mustang GT(4.6L, 5-speed) Daily Driver If I only wanted two pedals I'd have bought a bicycle.
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04-05-2008, 08:59 AM
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#9 |
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Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: 6 cyl MPG
See below. We've answered this question for you before...
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten... |
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04-05-2008, 01:57 PM
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#10 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 6 cyl MPG
a 230 in the panel?
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04-06-2008, 06:38 AM
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#11 | |
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Registered User
Join Date: Mar 2004
Location: Hoytsville, Utah
Posts: 3,365
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Re: 6 cyl MPG
Quote:
I never have bothered to find out what gears I have, 'cause the entire drivetrain is going away during the upcoming frame-off. I took it out today for the first time this spring-drove about a hundred miles, used just over a quarter tank of gas. I believe that my speedo is fairly close. There is a real bad turn on my route that has one of those 'Your Speed Is:' radar signs and It read within a couple of MPH of what the speedo said.
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'68 Panel Project Boogie Chillin' '68 C-10 Ol' Green |
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04-05-2008, 06:50 PM
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#12 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: 6 cyl MPG
Brad - you forgot the link
 I was thinking I had deja vu, now I just wonder how many times we're going to answer the same question this month.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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04-05-2008, 10:15 PM
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#13 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 6 cyl MPG
I thought its come up a few times... wasn't sure if it was the same guy.
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04-05-2008, 10:31 PM
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#14 |
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Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: 6 cyl MPG
Meh, I'll play anyway... Back when the old girl was a 250/3 speed manual/3.73... I got around 10-11 mpg.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride  American Born, Country by the Grace of God  1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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04-05-2008, 10:58 PM
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#15 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 6 cyl MPG
Yeah, we've been through this one every few months.
Quote:
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04-05-2008, 11:22 PM
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#16 | |
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Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: 6 cyl MPG
Quote:
I guess you could consider it that. I lived in the sticks. Mostly drove 50-60 mph everywhere I went. Truck probably could have used a tune up and a new carb. If I had put some money in it I might have gotten 12 or 13. I can only see getting 18mpg with a 5 speed/3.73 rear.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 04-05-2008 at 11:23 PM. |
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04-06-2008, 02:06 AM
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#17 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 6 cyl MPG
Quote:
For sure I was surprised since my 69 Chevy got no more than 14 on the highway with the old 250 three speed. This GMC, however, has only 28K original miles on it. I bored it over .030 because the rings were gummed up from sitting and while I had it open, decided to do it. |
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04-05-2008, 11:38 PM
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#18 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: 6 cyl MPG
i'll say it again, even though i have answered multiple times recently - with 3.73 gears, an L-250 with new single-bbl monojet carb, 3-on-the-tree with my muncie 3spd (which is in great shape and for sale), i was getting around 8-12mpg.
i can't imagine you'll get better than 12mpg with stock rear end and a 4bbl carb.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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04-06-2008, 07:11 AM
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#19 |
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Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: 6 cyl MPG
I hate to brag, but my 98 Tahoe gets 18 with the A/C on and pulling a 2,000 Lb trailer all over heck with a lawnmower and crap, and it has the 350, and a 4L60E, and it is not THAT much better aerodynamically than these trucks, but it does have OD and Fuel Injection, but does it make it that much better than a I6 truck? Doesn't seem like it should, but aparrently does.
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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04-06-2008, 11:56 PM
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#20 | |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: 6 cyl MPG
Quote:
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04-06-2008, 05:40 PM
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#21 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 6 cyl MPG
ed, late models have all kinds of things done to reduce friction, they are considerably more aerodynamic than you think.
Pritch... that is crazy huh? I bet it is pretty gutless huh? |
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04-06-2008, 07:58 PM
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#22 |
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Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: 6 cyl MPG
Whatever you say, your holyness
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A Last edited by ed2552; 04-06-2008 at 07:59 PM. |
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04-06-2008, 08:22 PM
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#23 |
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Registered User
Join Date: May 2006
Location: North x Northwest BC
Posts: 62
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Re: 6 cyl MPG
My stock '79 chev with a fresh 250, single barrel, 350 tranny was getting about 21 miles/Imperial gallon....nearly 18 a US gallon in mixed 50-60mph driving.
The '72 with 350 q-jet, 350 tranny was getting about 13miles/Imperial or 11 per US gallon. GPS confirmed my speedo inaccuracies and so accounted for. All with synthetic oil including the tranny of the '79 Oh yah we are now paying about $4.59 for a US gallon for 91premium here or $1.20 per litre Regular is about $1.12/litre $4.26/gallon Diesel around $4.60/gallon OUCH
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'70 Pontiac Firebird Esprit '72 GMC 2500 '90 GMC V1500 '94 Dodge Cummins 2500 '02 Dodge 2500 Quad Cab Long Box 4x4 gasser 
Last edited by 72gmcworker; 04-06-2008 at 08:27 PM. |
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04-06-2008, 08:27 PM
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#24 |
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Registered User
Join Date: Jan 2007
Location: Charles City IA
Posts: 1,626
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Re: 6 cyl MPG
i thought our diesel was bad at $3.95 out here in the sticks. Some of the semi drivers can't fill their trucks up all the way b/c their credit cards stop at $500.
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'67 C20, Under the Knife!, LWB, Eaton HO-52, Rear Coil Springs 72' GMC C2500, 350, TH400(?), Dana 60 '67 K10 4-spd., 305, SM465, Dana 44, 12 Bolt, RUST! '65 C60 292, 4 spd, 2 spd Rearend, 15' Grain Box, MINT! 09 Yukon Denali 82k Miles 6.2L/6A |
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04-06-2008, 09:49 PM
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#25 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 6 cyl MPG
a lot of that fuel cost is your local/state/fed taxes.
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