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#1 |
Cultural Infidel
![]() Join Date: Jan 2007
Location: Clearwater, FL
Posts: 668
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Gas milage: 6cyl vs. 8cyl
What gas milage do you get with a 6 cyl, automatic? With a 8 cyl, automatic?
-Mark
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posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold ![]() 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 ![]() ![]() It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished. |
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#2 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: Gas milage: 6cyl vs. 8cyl
"406" automatic = 7-8 mpg
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#3 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Gas milage: 6cyl vs. 8cyl
68 GMC six cylinder, 3 speed standard... 15-16 hwy
69 Chevy 350/350..... 14-16 hwy Last edited by 68gmsee; 05-21-2009 at 08:47 AM. |
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#4 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Gas milage: 6cyl vs. 8cyl
383 W/Th350 and GV overdrive: 15-16 on hiway....12-13 in town
454 W/Th400 : 9-11 MPG Diesel VW: 44+ MPG combined city and hiway....done as well as 52 MPG once....sorry couldn't resist...
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#5 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: Gas milage: 6cyl vs. 8cyl
TPI 350/ 700R4/ 3.73 gears : 18mpg highway
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#6 |
Senior Member
Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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Re: Gas milage: 6cyl vs. 8cyl
Very little difference in the 6 and 8 mileage. You might see 3 mpg more with the six if you are careful.
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Gas milage: 6cyl vs. 8cyl
the MPG listed here are not typical MPG of these trucks.
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#8 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
Posts: 24,461
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Re: Gas milage: 6cyl vs. 8cyl
With my I6 250/2spd powerglide, I have ranged from 12-21mpg, depending on my driving habits.
With my old '72, with a 400SB/TB350 I usually got 10mpg.
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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#9 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: Gas milage: 6cyl vs. 8cyl
1963 C-10 LB 230 6 cyl, 3 on tree, 12MPG (work truck,lots of city traffic).
1969 2500 "longhorn" 350,4spd (truck type) 373 gears, 11-12 MPG(same roads)
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#10 |
Registered User
Join Date: May 2009
Location: San Diego CA
Posts: 47
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Re: Gas milage: 6cyl vs. 8cyl
I was thinking that the 6 would get worse MPG because it needs to work harder to get the truck moving.
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#11 |
'71 chevy s.bed/s.side
![]() Join Date: Mar 2005
Location: Chesapeake, VA
Posts: 1,571
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Re: Gas milage: 6cyl vs. 8cyl
250 with 3 spd. manual & overdrive, with a/c on in the mountains & flat land = 16 mpg
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STILL PLAYS WITH CARS...AND TRUCKS!! Parents! Be good to your kids...they get to choose your nursing home! 250 I-6 with a 3 speed Saginaw and Borg Warner Overdrive...She's got overdrive! |
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#12 |
The Red Menace
Join Date: Feb 2009
Location: Roseburg, OR
Posts: 577
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Re: Gas milage: 6cyl vs. 8cyl
Isn't it mostly about the rear end gears and not the engine transmission combo? My 1/2 ton gets close to twice the mileage my old 3/4 ton Camper Special got and they both had 350/350's.
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1971 Custom 10 - 350/350TH - Pwr steering, gauges, Chrome front bumper, Chrome hubcaps, Door edge guards, HD rear springs (current) 1968 C-20 Custom Camper - 350/350TH (orig 327), Pwr steering & brakes, gauges w/tach (former) 1968 C-20 - 307/3sp column (Dad's when I was a kid) "Driving is like coloring. Things get messy if you can't stay inside the lines." |
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#13 |
Green club
Join Date: May 2002
Location: Central CA
Posts: 1,059
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Re: Gas milage: 6cyl vs. 8cyl
I run a 350 cid, aftermarket vortec heads, voodoo 262 equivalent cam, 10-1 compression, headers, performer intake, 1850 600 Holley with a dialed in HEI. The trans is a 700r4 with 3.42 rear gears.
I can't get better than 15 on the freeway, which I think is pretty decent considering. Now, add wind, higher than limit speed, traffic etc and it will dip down in the 12 range which is more common than 15 most of the time. Around town, 10 is normal so I average 11-12 overall. Never owned a 6cyl, so I have no comment on that engine ![]()
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71 short/fleet ECE 4/6 drop, LQ4/700r4/3.42 gears 70 SS396 Chevelle 427/200-4R/3.73posi 61 Lincoln Continental, black on black Son you are going to drive me to drinkin if you don't stop drivin that hot rod lincoln |
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#14 |
Out of the carpool lane.
Join Date: Jan 2000
Location: Clark Co, WA
Posts: 5,673
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Re: Gas milage: 6cyl vs. 8cyl
My old '67 with L6/T5/3.73 combo got a best of 18mpg with 150,000 miles on the clock. My current 350/350/3.08 gets a best of 13~14mpg with unknown miles, but it sure is fun!
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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... Last edited by Brad; 05-27-2009 at 08:31 AM. |
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#15 |
Registered User
Join Date: Jun 2008
Location: South Florida
Posts: 11,375
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Re: Gas milage: 6cyl vs. 8cyl
Some of these gas mileages are
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Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild |
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#16 |
Registered User
Join Date: Feb 2009
Location: OKC OK
Posts: 489
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Re: Gas milage: 6cyl vs. 8cyl
I gotta raise the flag too, I have heard of 15mpg plus 350 Chevrolets on the hiway, but I have yet to own one or witness it firsthand 12-13 mpg is it for these ole girls in stock form IMO. If you are doing better than that come by Idaho and give mine a tuneup please!
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"You can put lipstick on a pig, sure it's pretty pig, but it's still just a PIG... ![]() 71 ![]() Last edited by UltraBlue71; 05-27-2009 at 10:25 AM. |
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#17 |
Registered User
Join Date: Mar 2003
Location: Uvalde, Tx
Posts: 407
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Re: Gas milage: 6cyl vs. 8cyl
my 69 350/400 combination 10.5 mph.
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1969 C/10 Longbed undergoing rebuild. Old Chevy's Never Die, They Just Rust Around The Edges |
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#18 |
Registered User
Join Date: Nov 2007
Location: Scottsdale, AZ
Posts: 152
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Re: Gas milage: 6cyl vs. 8cyl
I get about 16 mpg combined city / hwy driving original 250 6cyl 3 spd with 3.73's.
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#19 |
Registered User
Join Date: Dec 2006
Location: Porter Ranch, CA
Posts: 978
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Re: Gas milage: 6cyl vs. 8cyl
It's all about those almighty RPM's! The more you get 'em down, the more MPG you're going to get (to a point, of course!). With 4.10's, I'm taching about 3050 at 70 MPH. I get a consistent 10 - 11 MPH with a somewhat built small block. it got 9 MPG bone stock, with choked up exhaust, Quadra-puke, and oil bath air cleaner. I've probably gained 75 HP and gained 10 - 20% in mileage; I have no complaints... wait, yes I do...
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#20 |
Registered User
Join Date: Jul 2007
Location: Salina, Kansas
Posts: 1,998
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Re: Gas milage: 6cyl vs. 8cyl
402 big block/auto.. i get about 4.. that is because im 18 years old and i have a heavy right foot..
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1972 C-10...402/400..flowmaster 40 series 1967 Mustang 347 stroker/C-4 1966 Mustang 289/3-speed 2013 Mustang V6/6speed w/300 ponies I may be 23, but i sure do knows 67-72s are sexy! Its not MPG its smiles per gallon! build started 11/25/08 build thread: http://67-72chevytrucks.com/vboard/s....php?p=2993796 |
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#21 |
Registered User
Join Date: Nov 2008
Location: FOREST MS
Posts: 92
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Re: Gas milage: 6cyl vs. 8cyl
327 700r 373 17 hwy
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#22 |
Registered User
Join Date: Feb 2009
Location: OKC OK
Posts: 489
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Re: Gas milage: 6cyl vs. 8cyl
Holy Smokes, I knew 402's were bad, but damn! You must have a good job, or no bills, or both! Your dumping all that hard earned pay right into the tank, let off er son, let off er! Four Barrels are alot of fun tho!
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"You can put lipstick on a pig, sure it's pretty pig, but it's still just a PIG... ![]() 71 ![]() |
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#23 |
Registered User
Join Date: Dec 2006
Location: Porter Ranch, CA
Posts: 978
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Re: Gas milage: 6cyl vs. 8cyl
When I was 18, I had my dad's '69 3/4 ton 307 4 BBL 4-speed. I floored it all the time too. The advantage was having that 307 instead of a big block, so I'd still get about 9 - 10 with my foot through the floor board.
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#24 |
Cool Truck
Join Date: Dec 2008
Location: Bowie,MD
Posts: 1,869
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Re: Gas milage: 6cyl vs. 8cyl
I got a 292 with a 5 speed and I get between 8-12 mpg
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1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed |
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#25 |
Registered User
Join Date: Nov 2006
Location: Alabama
Posts: 120
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Re: Gas milage: 6cyl vs. 8cyl
My inline 6 got 13.5 last time I checked. it was before I tweeked the carb , I'm hoping to have 15 in sight next time I check.
Manual trans.
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