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#1 |
Registered User
Join Date: May 2012
Location: Raleigh, NC
Posts: 639
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I know a 67-72 chevy is going to be a hog on gas. I'm cool with that.
![]() SO, what do you guys get as far as gas mileage in your trucks? Details to give: Auto/Manual, Bed Size/type, Engine, gearing, etc. |
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#2 |
Newbee
Join Date: Jan 2010
Location: Phoenix, Arizona
Posts: 1,406
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Re: Gas Mileage?
My longbed got 10 when it was 2wd. Fairly stock motor .030 over, AFB, TH400, probably the same gears.
Now 4x4, 3.73 gears, TH400, .060 over, gets a solid 8 MPG! Bathroom breaks, are a non issue ![]() |
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#3 |
Registered User
Join Date: May 2012
Location: Raleigh, NC
Posts: 639
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Re: Gas Mileage?
phew. big change from my wifes MINI at 35 mpg average!! I guess we even eachother out
![]() Oh and I forgot mine is 2WD, the 350, stock motor as far as i know |
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#4 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Gas Mileage?
i would say you can expect between 10-14 mpg depending on driving habits and rear gear ratio. Probably the best bang for the buck upgrade you can do is to install an overdrive transmission like a 700R4 - a pretty simple swap since you already have a th350. Search this site for 700R4 and you'll find plenty of articles. That will give you better bottom end performance also because of the higher numerical gear for 1st in a 700 vs the 350. Around town you won't see much of a difference in mileage, but on the highway, the 700 will improve it quite a bit. If you won't see much highway time, probably not worth the swap, but if long trips may be in your future, I'd consider one. Might get you up into the high teen for highway mpg.
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#5 |
Registered User
Join Date: May 2012
Location: Raleigh, NC
Posts: 639
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Re: Gas Mileage?
Thanks Jocko!
I don't do much highway driving, but every now and then I drive to my folks lake house that is about an hour away so it might be worth it. Maybe if I find a 700 for the right price one day when I've got some time for the swap I would consider it. 10-14 is about what I was expecting. |
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#6 |
Registered User
![]() Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,208
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Re: Gas Mileage?
Old truck
8 mpg - $400 month gas bill - super cool and makes you happy. No payment. Appreciates monthly, things you add to it make it worth more for the most part. Safe, solid. New (anything really) 35mpg avg - Gas bill 25% of the truck, BUT ~$500/mo. car payment. + $100 mo. in depreciation, $100 month in intrest. Keep it two years, you're luck to break even. Coolness factor goes way down. You get in any type of accident, you and your family are in more danger of being hurt. My point being, yes these trucks are gas hogs but apples to apples it doesn't really hurt as bad as it seems. My old GMC gets 22mpg or so. Stock 350, 3OTT. SWB, stock gearing. (feels like 3:55 maybe, non posi. SWB truck, drive like a grandpa and tractor it around a little bit. No high RPM, or twisting it up any at all) I could buy a new truck and get 22mpg. .. but why? Loose my butt in depreciation ? My Big Block truck, that will be different absolutely but I don't drive it every day. I'll keep my wife in the new model car, leather, air conditioning, etc. I'm good with my trucks and put $500 mo into them instead of the payment. Just my .02.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) Last edited by CC69Rat; 05-25-2012 at 11:33 AM. |
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#7 |
Senior Member
![]() Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,282
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Re: Gas Mileage?
I average 13-14 with my 70 2wd swb 250/TH400 3.73 but I don't drive it on the highway, only about 20-25 miles a day back and forth to work or running to the store for something.
Wife has 04 GMC Envoy 4X4 w/4.2 and overdrive, it averages 16, but again, not really any long trips. So like CC69Rat said, the coolness factor is much higher in the 70.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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#8 | |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: Gas Mileage?
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#9 |
Senior Member
![]() Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,282
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Re: Gas Mileage?
To add to CC69Rat's comments, my plates cost $41.75 every year and insurance is approximately $20/month. Granted, that is PL/PD but it ain't no show truck!
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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#10 |
Registered User
Join Date: Feb 2010
Location: salem oregon
Posts: 225
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Re: Gas Mileage?
New rebuild, .30 over, headers,454, 1971 GMC LONGHORN SIERRA GRANDE, 6-8 m.p.g.
drive it everyday, what a fool, huh? I LOVE IT!!!!
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In the words of my favorite poet, singer/songwriter (Paul Thorn) ![]() |
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#11 |
Registered User
Join Date: Aug 2011
Location: Gardnerville Nevada
Posts: 270
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Re: Gas Mileage?
Funny CC69Rat, I just bought my wife a new-used beautiful 2002 Lexus. Leather, Air, GPS, all the crap I don't want nor need. But she's happy as all get-out. I'll keep working on my truck and have something EVERYONE else want's but's afraid to put the time and work into. Also, my current truck is a 2003 with 63,000 miles on it, so I really don't care about the mileage.... Would much rather have the coolness factor of driving something unique. You couldn't have explained it much better.... But to answe the first question, I expect to get around 10 mpg with my truck. New 330 hp crate motor (350), 4 wheel drive with 33" tires.
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Check out my build: http://67-72chevytrucks.com/vboard/s...d.php?t=512620 |
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#12 |
Registered User
![]() Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,208
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Re: Gas Mileage?
Just to clarify, I am 39yrs old and I have owned 38 cars in my life time. A lot of new ones, sticker cars .. drive them off the lot and you loose $6-7k immediately. I just got tired of loosing my butt.
People want to push their trucks off a cliff when gas hits $4k a gallon, but want to pay $30k+ ($500-$600 mo) for a Prius because it saves 20mpg ? (no offense intended) .. I just don't get it personally. Do you know how much gas you can buy with $600 a month + residual loss in the new cars? I'm as guilty as the next person, really. I bought a 2007 BMW 335 sedan 6speed a couple years ago because I had a (friggin sweet!!, perfect paint) 2007 Silverado Ext cab. polished 20's, flowmasters, etc. But I was afraid the gas would hurt me too much. I bought this Bimmer to be cool .. Yeah. $700 a month. 24Mpg on a good day. My truck got 18 or so. The bimmer was fast, but wasn't fast enough to outrun the depreciation! $36,500 - $20,000 when I sold it. $16,500 residual loss. (24 months I owned it. $687.50x24 ? = $16,500. ![]() ![]() ![]() I just made a point, I would never loose my butt if I could help it. Everything I put into my trucks makes them better. When I made the payments on the BMW, I might as well have flushed it down the toilet. Proof: So, for $687.50 per month I can buy 172 gallons of gas. .. or roughly 3100 miles a month and that's just the payment. Try insurance on a 335, maintenance costs, etc. It was a bonehead move for sure. Never again. Again, not trying to stir anyone up. Just my opinion. I've been there. Kinda puts a new perspective on saving 2-3 mpg huh ? ![]()
__________________
Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#13 |
Registered User
Join Date: Aug 2007
Location: Boise, Idaho
Posts: 676
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Re: Gas Mileage?
I get 8 to 10, mostly 8 because I like the sound and power so a little heavy on the peddle...ha...
Yep plates are 10 a year, insurance is 20 a month a water pump is 26 bucks and 3 beers later up and running...love driving my truck...no way am I going to any newer truck, I'll buy the gas and get thumbs up from lots of on lookers.
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1968 4x4 Frame, with a 67 Cab and Bed A Shorter Step 1999 Dodge 2500 Cummins Diesel |
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#14 |
Registered User
Join Date: May 2011
Location: Colstrip, MT
Posts: 39
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Re: Gas Mileage?
71 GMC, 400sb, 700R4, 3.73 posi, late model Qjet that I tinkered with substantially - I don't really track mileage any more, but after I had everything together, I ran a hundred ten mile roundtrip as a test (ten miles in town, 100 highway) and used 5.5 gallons.
Good enough. |
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#15 |
Registered User
Join Date: Feb 2010
Location: ELIZABETH CITY
Posts: 87
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Re: Gas Mileage?
1968 short bed with stock 350 crate engine, 3 speed and 3.07 rear gears, been averaging between 10 and 11 mpg doing mostly four lane highway between Elizabeth City NC and Portsmouth Va.
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#16 |
Registered User
Join Date: Jan 2011
Location: Lynn Haven Florida
Posts: 1,019
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Re: Gas Mileage?
70 swb c-10 , 383, turbo 350, 3:73's = 8 mpg
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#17 |
Registered User
Join Date: Oct 2009
Location: port robinson ontario canada
Posts: 398
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Re: Gas Mileage?
Tired 283 2bl, t400 , stock gears (3.73?). 14-17mpg .
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#18 |
Who's got steelies?
![]() Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,026
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Re: Gas Mileage?
Seems to vary with quality of gasoline.
Last tank ethonol free 16.1 mpg Up to 10% ethenol average 14.5 mpg. My set up: rebuilt .030" over 305 9.3:1 flat top pistons 1977 Q-jet TH350 3.07 rear end gears 225-75R15 tires 195-degree stat I'm happy. ![]()
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#19 |
Registered User
Join Date: Nov 2011
Location: Sheffield, ALA
Posts: 2,471
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Re: Gas Mileage?
350-.030 over-3.08 = 5-8 mpg 32 mile round trip running 50 to 60 mph.
Drove nearly 200 miles today to a car show and averaged about 14.6. Ran around 55 to 60 mph.why the big diffrence? I bought a tach and it showing 2300rpm at 60 mph.Is that about rite for 3.08's? |
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#20 |
Registered User
Join Date: Jun 2010
Location: Wallingford,Ky
Posts: 22
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Re: Gas Mileage?
71 C-30, 327 .030 over, RV cam, bulldog 4-speed, 4.11 gear. For years I got 10-11 but the carb never seemed to be right no matter how much I worked on it. Put a can of Seafoam in the tank, 5 miles down the road it was like driving a different truck! Now I get right at 13mpg. But I'm in the process switching over to a 700r to make it driver friendly for my daughter. We'll see how that changes my mileage.
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#21 | |
Registered User
Join Date: Jan 2011
Location: Lynn Haven Florida
Posts: 1,019
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Re: Gas Mileage?
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#22 |
Registered User
Join Date: Feb 2012
Location: JBLM, WA
Posts: 153
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Re: Gas Mileage?
305 V6/SM465/ no idea my rear end. 3.73-4.11 Never looked, no codes, tags rusty. I'm too lazy to raise and spin my wheel and count
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68 GMC C2500 - 305 V6 - 4spd |
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#23 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: Gas Mileage?
Best of luck and we luv road trip pics
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A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! |
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#24 |
Registered User
Join Date: May 2011
Location: St. Paul, Ore.
Posts: 145
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Re: Gas Mileage?
I just filled my 70 suburban up yesterday. With a 350, 4 speed manual, a 6" lift, and 33's, I got 15.8mpg's. Not complaining one bit. I came from a 2008 F450 with 4.88 gears that got 10mpg's. The 450 was cool, but I never had business cards left on the window asking me if I wanted to sell it or people taking pictures of it while I'm driving down the freeway.
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#25 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Gas Mileage?
I have never seen much mileage out of the old longhorn...7-8 mpg in town. I really have not checked open the road, but the old booger will run 105, in OD @ 3150 on the tach. Could be that the "lead foot" is the problem
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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