What's your MPG? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Montierth · 01-22-2020, 09:04 PM

Just for fun what's you MPG and specs?

I have a crate 350 SBC, 4 barrel Edelbrock with headers and turbo 350 tranny. Today I calculated 11.9 MPG on mine. I guess it could be worse so not bad.

**Steeveedee** · 01-22-2020, 09:41 PM

As in my sig, including that cabover camper shell, 10 MPG in combined driving. I'll get a chance to recheck the mileage pulling the (6000 pound) travel trailer in a few weeks. It used to get 7, but I discovered a popped diaphragm on the vacuum advance, so we shall see. I also went to non-ported vacuum advance. It won't make any difference on a pull, but should help some at cruise. That 7 MPG was three years ago driving the 118/405/5/14/etc to Randsburg, CA. Lots of long grades going there, and had some cooling problems. The truck suffered. The cooling problem is well and truly dead, though.

**Sheepdip** · 01-22-2020, 10:36 PM

If I was to check my mileage I'd probably quit driving Otis, so I'll just keep driving him.

Sweeet67 · 01-22-2020, 10:44 PM

By today’s standards? Not good. Lol
I do have a bigger grin on my face though.

**HO455** · 01-22-2020, 10:53 PM

67 Burban with a generic SB 350, T400 and a Qjet. Low 12 mpg city. High 14 mpg highway. That's a flat highway with no wind and a steady 60 mph. Add hills or wind or 65 mph it's back to 12.

I've got an overdrive upgrade in the works, I'm hoping to get a solid 15 out of it and maybe get the city to come up a bit.

LS short box · 01-22-2020, 10:58 PM

On my 68 C10 LS1/T56 swap I've seen 22 mpg on most 60-65 mph drives in the country. 4:10 gears. 20 inch wheels. The T56 has the .50 overdrive in 6th. The LS1 was tuned on a chassis dyno and then "road" tuned on the laptop after a couple of weeks of break in driving. RWHP 380 hp.Basic LS1 rebuild. AFR heads,forged rods and pistons. Small cam 220I/225E. 114 c/l.
I know it's not monster hp numbers but it runs really well and it's not slow. Around town only about 18 mpg.

**WorkinLonghorn** · 01-23-2020, 03:05 AM

I was getting 11 mixed driving. After break-in I'll check this new crate engine for any increase (maybe a big 12 MPG if lucky). -BA

**special-K** · 01-23-2020, 03:30 PM

I get truck mileage.

**Steeveedee** · 01-23-2020, 04:07 PM

Quote:

Originally Posted by special-K

I get truck mileage.

A guy I used to work with had a bumper sticker on his 1T 4-door 4X4 long bed Ford- "Life isn't only about gas mileage". I like to get economy, but I don't care when I'm pulling the travel trailer, it's just gonna suck the gas down to move the thing. We're going camping middle of next month. We'll see how it does.

Barnfind46 · 01-23-2020, 04:15 PM

I get between 13 mpg and 15. 13 more than 15.

**tdangle** · 01-23-2020, 06:17 PM

Was around 9-10.5 city/hwy did not make a difference with the TH350 trans and 4.10 gears. Now around 10-11 around town and just last week 16.2 at 70-75 mph on the hwy with my 2004r od trans.

Montierth · 01-23-2020, 06:36 PM

I bet I could squeeze a couple more MPG out of my truck but I'm still the the breaking in - joyriding time with my new engine. I'm having too much fun laying into the gas pedal.

mygmctruck1 · 01-23-2020, 11:47 PM

I have never cared about fuel mileage , if I can not afford fuel after my investment , then why do I have this thing .
But just for kicks my 351 modified Mach 1 gets 18 mph

GMC72BB · 01-24-2020, 12:10 AM

72 Big Block 402, with mild cam, roller rockers, Holley, etc, foot on the skinny pedal, I get gallons per hour,,,,not miles per gallon,,

mygmctruck1 · 01-24-2020, 12:27 AM

Quote:

Originally Posted by GMC72BB

72 Big Block 402, with mild cam, roller rockers, Holley, etc, foot on the skinny pedal, I get gallons per hour,,,,not miles per gallon,,

Or gallons per mile !

underliner6 · 01-24-2020, 09:26 AM

I get a consistent 39 smiles per gallon/ Highway and 30 smiles per gallon/ City.

mygmctruck1 · 01-24-2020, 10:02 AM

Quote:

Originally Posted by underliner6

I get a consistent 39 smiles per gallon/ Highway and 30 smiles per gallon/ City.

But not in a truck

Custom 68 · 01-24-2020, 11:07 AM

Smiles are where its at...
I don't do too bad around 17 on the highway. mine is a 5.3 mild cam and turbo thru a 4l80 and 3.73 gears. It sure is fun tho.
Dave

OregonNed · 01-24-2020, 11:30 AM

Whenever I check, about 14

Montierth · 01-24-2020, 11:53 AM

My 03 Silverado single cab short bed only gets 16 MPG. So I think anywhere near there is good.

toolboxchev · 01-24-2020, 01:03 PM

Better even, I just pay for the fuel as I do not make a car payment.

For me that is the question answered for accounting purposes.

Montierth · 01-24-2020, 01:15 PM

I agree with you all. I'm gonna drive it no matter the MPG. Just was curious if I was in the ballpark for MPG

mygmctruck1 · 01-24-2020, 01:32 PM

My 2017 GMC ext cab gets average 18 mph , if I drive the actual posted speed limit 20 mph

garyd1961 · 01-24-2020, 01:42 PM

I never checked the mileage on my 70 C10 with a 350 vortec and th350 trans. I do know it gets a lot better mileage if I drive it easy but that ain't no fun.

Truckenrc · 01-24-2020, 02:13 PM

I've got a 1969 C10 with a Ls3 and 4L80E and 3.05 gears on 3in lift and 33s. Daily driven 50 miles on the freeway everyday getting 22mpg. But I always seem to have that skinny pedal buried more then I should.

01-22-2020, 09:04 PM	#1
Montierth Registered User Join Date: Dec 2016 Location: QUEEN CREEK, AZ Posts: 269	What's your MPG? Just for fun what's you MPG and specs? I have a crate 350 SBC, 4 barrel Edelbrock with headers and turbo 350 tranny. Today I calculated 11.9 MPG on mine. I guess it could be worse so not bad. __________________ 1970 GMC C1500 short fleet Sellers Regret - 1950 GMC - 1967 Chevy C10 - 1970 GMC C2500 Dually Flat Bed - 2003 Silverado

01-22-2020, 09:41 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,087	Re: What's your MPG? As in my sig, including that cabover camper shell, 10 MPG in combined driving. I'll get a chance to recheck the mileage pulling the (6000 pound) travel trailer in a few weeks. It used to get 7, but I discovered a popped diaphragm on the vacuum advance, so we shall see. I also went to non-ported vacuum advance. It won't make any difference on a pull, but should help some at cruise. That 7 MPG was three years ago driving the 118/405/5/14/etc to Randsburg, CA. Lots of long grades going there, and had some cooling problems. The truck suffered. The cooling problem is well and truly dead, though. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

01-22-2020, 10:36 PM	#3
Sheepdip Senior Member Join Date: Nov 2018 Location: Waterford California Posts: 2,375	Re: What's your MPG? If I was to check my mileage I'd probably quit driving Otis, so I'll just keep driving him.

01-22-2020, 10:44 PM	#4
Sweeet67 Registered User Join Date: Aug 2016 Location: Idaho Falls, ID Posts: 233	Re: What's your MPG? By today’s standards? Not good. Lol I do have a bigger grin on my face though.

01-22-2020, 10:53 PM	#5
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,803	Re: What's your MPG? 67 Burban with a generic SB 350, T400 and a Qjet. Low 12 mpg city. High 14 mpg highway. That's a flat highway with no wind and a steady 60 mph. Add hills or wind or 65 mph it's back to 12. I've got an overdrive upgrade in the works, I'm hoping to get a solid 15 out of it and maybe get the city to come up a bit. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

01-22-2020, 10:58 PM	#6
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 1,922	Re: What's your MPG? On my 68 C10 LS1/T56 swap I've seen 22 mpg on most 60-65 mph drives in the country. 4:10 gears. 20 inch wheels. The T56 has the .50 overdrive in 6th. The LS1 was tuned on a chassis dyno and then "road" tuned on the laptop after a couple of weeks of break in driving. RWHP 380 hp.Basic LS1 rebuild. AFR heads,forged rods and pistons. Small cam 220I/225E. 114 c/l. I know it's not monster hp numbers but it runs really well and it's not slow. Around town only about 18 mpg.

01-23-2020, 03:05 AM	#7
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,855	Re: What's your MPG? I was getting 11 mixed driving. After break-in I'll check this new crate engine for any increase (maybe a big 12 MPG if lucky). -BA __________________ '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, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

01-23-2020, 03:30 PM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: What's your MPG? I get truck mileage. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-23-2020, 04:15 PM	#10
Barnfind46 Registered User Join Date: Aug 2014 Location: Mena,Arkansas Posts: 485	Re: What's your MPG? I get between 13 mpg and 15. 13 more than 15. __________________ 68' with no bells or whistles unless I add'em.

01-23-2020, 06:17 PM	#11
tdangle Senior Member Join Date: Mar 2005 Location: Jurupa Valley, Ca Posts: 1,209	Re: What's your MPG? Was around 9-10.5 city/hwy did not make a difference with the TH350 trans and 4.10 gears. Now around 10-11 around town and just last week 16.2 at 70-75 mph on the hwy with my 2004r od trans. __________________ Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC

01-23-2020, 06:36 PM	#12
Montierth Registered User Join Date: Dec 2016 Location: QUEEN CREEK, AZ Posts: 269	Re: What's your MPG? I bet I could squeeze a couple more MPG out of my truck but I'm still the the breaking in - joyriding time with my new engine. I'm having too much fun laying into the gas pedal. __________________ 1970 GMC C1500 short fleet Sellers Regret - 1950 GMC - 1967 Chevy C10 - 1970 GMC C2500 Dually Flat Bed - 2003 Silverado

01-23-2020, 11:47 PM	#13
mygmctruck1 Registered User Join Date: Jun 2018 Location: Munising,Mi Posts: 360	Re: What's your MPG? I have never cared about fuel mileage , if I can not afford fuel after my investment , then why do I have this thing . But just for kicks my 351 modified Mach 1 gets 18 mph

01-24-2020, 12:10 AM	#14
GMC72BB Registered User Join Date: Dec 2019 Location: JACKSONVILLE Posts: 51	Re: What's your MPG? 72 Big Block 402, with mild cam, roller rockers, Holley, etc, foot on the skinny pedal, I get gallons per hour,,,,not miles per gallon,,

01-24-2020, 09:26 AM	#16
underliner6 Registered User Join Date: Oct 2013 Location: Montrose, CO Posts: 328	Re: What's your MPG? I get a consistent 39 smiles per gallon/ Highway and 30 smiles per gallon/ City. __________________ Jim 1972 K20 Cheyenne- 350/350/205 1972 K20 Cheyenne - 350/SM465/205

01-24-2020, 11:07 AM	#18
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,930	Re: What's your MPG? Smiles are where its at... I don't do too bad around 17 on the highway. mine is a 5.3 mild cam and turbo thru a 4l80 and 3.73 gears. It sure is fun tho. Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"



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01-24-2020, 11:30 AM	#19
OregonNed Registered User Join Date: Dec 2012 Location: Vancouver, Washington Posts: 1,644	Re: What's your MPG? Whenever I check, about 14 __________________ 1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop

01-24-2020, 11:53 AM	#20
Montierth Registered User Join Date: Dec 2016 Location: QUEEN CREEK, AZ Posts: 269	Re: What's your MPG? My 03 Silverado single cab short bed only gets 16 MPG. So I think anywhere near there is good. __________________ 1970 GMC C1500 short fleet Sellers Regret - 1950 GMC - 1967 Chevy C10 - 1970 GMC C2500 Dually Flat Bed - 2003 Silverado

01-24-2020, 01:03 PM	#21
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: What's your MPG? Better even, I just pay for the fuel as I do not make a car payment. For me that is the question answered for accounting purposes.

01-24-2020, 01:15 PM	#22
Montierth Registered User Join Date: Dec 2016 Location: QUEEN CREEK, AZ Posts: 269	Re: What's your MPG? I agree with you all. I'm gonna drive it no matter the MPG. Just was curious if I was in the ballpark for MPG __________________ 1970 GMC C1500 short fleet Sellers Regret - 1950 GMC - 1967 Chevy C10 - 1970 GMC C2500 Dually Flat Bed - 2003 Silverado

01-24-2020, 01:32 PM	#23
mygmctruck1 Registered User Join Date: Jun 2018 Location: Munising,Mi Posts: 360	Re: What's your MPG? My 2017 GMC ext cab gets average 18 mph , if I drive the actual posted speed limit 20 mph

01-24-2020, 01:42 PM	#24
garyd1961 Registered User Join Date: May 2016 Location: Henderson NC Posts: 975	Re: What's your MPG? I never checked the mileage on my 70 C10 with a 350 vortec and th350 trans. I do know it gets a lot better mileage if I drive it easy but that ain't no fun.

01-24-2020, 02:13 PM	#25
Truckenrc Registered User Join Date: Feb 2019 Location: Vacaville california Posts: 11	Re: What's your MPG? I've got a 1969 C10 with a Ls3 and 4L80E and 3.05 gears on 3in lift and 33s. Daily driven 50 miles on the freeway everyday getting 22mpg. But I always seem to have that skinny pedal buried more then I should.

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