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#1 |
C10 addict
Join Date: Apr 2006
Location: Arizona
Posts: 2,432
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Fuel economy for an I6? What's your gas mileage?
I'm looking at purchasing a 67 short fleet that has an I6 with a 4 speed manual on the floor and 3.08 gears. I was planning on keeping it a 6 cylinder, mainly for better fuel economy. But the owner told me that the I6 250 and 292 with the monojet carb gets worse gas mileage than a 2 barrel sbc.
I find this hard to believe so I thought I'd do a poll. To the guys still running your 6 cylinder, what kind of gas mileage are you getting and with what gears and tranny?
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Jared 67 C10 CST Short Fleet Big Window 65 C10 Custom Short Fleet Big Window 67 Camaro RS |
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#2 |
Registered User
Join Date: Jun 2007
Location: Edmonton, Alberta
Posts: 423
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Re: Fuel economy for an I6? What's your gas mileage?
I have a 250, with a 3speed and 3.73s. the PO told me the engine was slightly worked over, I'm not sure if i believe him or not although im farly sure it has an RV type cam to it, and i can obviously tell it has a dual header on it. My speedo it broken so it's hard to tell accurately what kind of mileage i get, but judging by where i drive/how much i spend on gas i would guess that it is hovering around 13mpg.
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#3 |
Chevy nut
Join Date: Jun 2007
Location: Springfield, Illinois
Posts: 2,266
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Re: Fuel economy for an I6? What's your gas mileage?
I know I put 10.00 in mine today. I6 with a granny 4 speed. I think 3:73's maybe. In town traffic stop go crap. Also hauling stuff...remains of fox body mustangs....I went about 35 miles on that 2 gallons of gas. So it's not doing bad.
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84 Chevy Custom Deluxe 1/2 Ton Named Fade To Black II "Remember kids there is NO replacement for displacement!" |
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#4 |
Junior Member
![]() Join Date: Mar 2007
Location: DAYTON
Posts: 505
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Re: Fuel economy for an I6? What's your gas mileage?
Stock 250, 3 speed. I am not sure of my rear gear, but it screams @ 60 MPH...
highway is 14ish. I think it is runnin a bit rich. Electronic ignition is coming, so I hope that helps a bit...
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frontstreetcycle on Instagram |
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#5 |
Account Suspended
![]() Join Date: Jul 2007
Location: Wichita KS
Posts: 1,599
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Re: Fuel economy for an I6? What's your gas mileage?
I have a 292 with a granny 4 speed with 4:10 posi rear. Average 11-14 mph but I run the snot out of her.
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#6 | |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Fuel economy for an I6? What's your gas mileage?
Quote:
My 250 with 3 speed standard and 3:54 axle is getting about 16 mpg average. On the highway I think it's closer to 17 but I drive both city and highway. I like the fact that the one you're looking at has 4 speed trans with 3:08. I've been kicking the idea of changing mine to 3:08 rear axle and slapping a 700r4 on it with my 250... Maybe. |
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#7 |
Registered User
Join Date: Jul 2006
Location: Oldenburg, Indiana
Posts: 199
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Re: Fuel economy for an I6? What's your gas mileage?
my stock 230 with 3 speed, longtube headers, clifford intake and 500 edelbrock gets 15 around town. i do very little highway driving so im not sure what its doin there, id say its a bit better on the highway. 3.08 rear end.
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#8 |
Built 4 Speed
Join Date: May 2008
Location: Geneva FL
Posts: 619
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Re: Fuel economy for an I6? What's your gas mileage?
i got a 350 i get 15 if i baby her. but this I-6 isnt a huge issue mpg wise its the driver many times
Copperhead was equipped with a 572. and a feather light foot gave it 12 mpg at 720 hp.
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1969 C/10 Short Box: 496/T-56 in worx. ![]() "To Be Old And Wise, First You Must Be Young And Stupid" |
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#9 |
C10 addict
Join Date: Apr 2006
Location: Arizona
Posts: 2,432
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Re: Fuel economy for an I6? What's your gas mileage?
Thanks for all the good info, looks like the gas mileage of an I6 is on par with that of a sbc.
Can A/C be added to an I6?
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Jared 67 C10 CST Short Fleet Big Window 65 C10 Custom Short Fleet Big Window 67 Camaro RS |
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#10 | |
FarmBoy.
Join Date: Feb 2005
Location: Rhinelander, WI
Posts: 1,103
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Re: Fuel economy for an I6? What's your gas mileage?
You also have to remember, that yes, I6 and V8s get almost the same mileage, but most of the I6's are on their last leg while being ran. So people will pull them, and slap in a fresh 350, and say "oh, look, just as good as that 6".
I'm getting about 17 with my tired 307. So, I'm not complaining. But theres little doubt in my mind that a fresh 6 could pull as hard and get as good of mileage as the sbc. Personal opinion backed by little to no research though, so, yeah. -Sam.
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1969 GMC C1500. long fleet. 307. 3 on the tree. 3.07 gears. Oliver green. Bent and bruised. Daily Driver. Quote:
http://67-72chevytrucks.com/vboard/s...d.php?t=242993 |
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#11 |
Senior Member
![]() Join Date: Jan 2000
Location: Arlington, VA
Posts: 398
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Re: Fuel economy for an I6? What's your gas mileage?
71 Short bed stepside
250 stripper model the only option listed on the glove box plate is "rear bumper" weight with 200lb driver and half tank gas 3750lbs 3.73 rear with a Tremec TKO 5 speed (0.68 5th gear OD) pertronix ignition in the distributor I drive it daily to work I get 15mpg without trying If I pay attention to milage I get 17 in town Highway is 19-21mpg Last edited by Willy Prost; 06-25-2008 at 07:27 PM. Reason: I wasn't finished and I hit the wrong button |
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#12 | |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: Fuel economy for an I6? What's your gas mileage?
Quote:
![]() My 250 is tired and has about 150,000 miles and with the T-5 I'm getting about 17mpg @ 65mph. I know that a good solid refresh with porting and a bump in compression would seriously increase this. Oh, and anyone considering going 3.07's with a 250-don't do it! Unless you drive alot of highway miles, your in town economy will decrease and you'll get sick of having to ride the clutch to get it up and rolling from a dead stop. Ask me how I know.
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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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#13 |
Official Site Guitar Shredder
Join Date: May 2006
Location: Oz
Posts: 3,955
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Re: Fuel economy for an I6? What's your gas mileage?
i run a stock bottom end 250...(85,000 miles) fully re-worked the head (after a over head few years ago)..stock carb. single exhaust with a 40 series flowmaster..3-speed .with 3.73s...i get 12 mpg in town..and 15/16 on the highway.....probably could do better with a tune up(been about 10,000 miles)....,and electronic ignition.....
Last edited by bad6772; 06-30-2008 at 10:30 PM. |
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#14 |
Registered User
![]() Join Date: Jan 2007
Location: Fort Worth, TX 76133
Posts: 406
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Re: Fuel economy for an I6? What's your gas mileage?
I have a 71 Chevy C-10 LWB with a 250 and three speed manual trans, HEI, and 31 tall tires,,,,, unsure of rear end gears at this time... I get 16 MPG in the city and I have never taken the truck on a long highway cruise so unsure of the highway mileage.
I can say it has over 142,000 miles on a non rebuilt engine and now has an HEI distributor which has the truck running smoother and more efficent. With the old points distributor you could always smell gas fumes at the tail pipe and was getting close to 13 MPG in the city, and the engine ran rough.....
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#15 |
Mean Buzzin' Half Dozen
Join Date: Mar 2008
Location: Orlando, Florida
Posts: 1,081
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Re: Fuel economy for an I6? What's your gas mileage?
Does anyone know if my 250 with a 2 spd Powerglide would get better or worse mileage than whats stated above? I was at least hoping for 18.
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"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
MY TRUCK (Now for sale) 1967 C10 SWB Dylan |
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#16 |
"Trucks with Class"
![]() Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,132
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Re: Fuel economy for an I6? What's your gas mileage?
I used a '69 short stepside PU for a test mule:
1. I ran a stock 250 with 4spd & 4:10 posi (slow & boring). 2. Added a 700-R4 trans. It was a pain to get all that junk hooked up and then... (250 wouldn't pull the OD). 3. Added a stock 292 (now it would pull the OD fine). 4. Added alum intake, 4bbl, headers, HEI (now this was starting to be fun). 5. Blew up the 292!!! ***Gas mileage??? Not a clue. LOL. I never had one setup running long enough to check it. |
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#17 |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: Fuel economy for an I6? What's your gas mileage?
My guess is probably worse in a truck, however I get about 18-22 @ 60 in my all stock Camaro depending on whether I'm following a big rig.
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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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