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

Hazieview · 07-21-2009, 01:51 AM

Just wondering how everyone was doing on fuel. So let us know what is your MPG and your setup. Thanks!

flamingbig10 · 07-21-2009, 02:11 AM

I get about 5 to 8 in town that's with a sightly modified 350 with a junky quadra jet that's work wright very rarely also th350 and 373 gears

Orange77 · 07-21-2009, 02:20 AM

why not swap it to a eddy and avoid probs?

flamingbig10 · 07-21-2009, 02:37 AM

I had one but it was messed up by the past owner and was only getting 5 mpg on good day so got a rebuilt quadra jet and no luck couldn't get it tuned wright so I took it to a couple old school mechanics no luck it do good for a wile then next day it will bog down like crazy and spit and sputter, but I'm saving for a new carb so then I should be getting 8 or better

Dave Kay · 08-15-2009, 05:39 PM

Quote:

Originally Posted by flamingbig10

I had one but it was messed up by the past owner and was only getting 5 mpg on good day so got a rebuilt quadra jet and no luck couldn't get it tuned wright so I took it to a couple old school mechanics no luck it do good for a wile then next day it will bog down like crazy and spit and sputter, but I'm saving for a new carb so then I should be getting 8 or better

Hey now! Get that Q-Jet done up right at this place http://www.smicarburetor.com/

Highly reccomended, SMI's carbs will make your truck run like a top right outta' the box!

BTW: my '86 GMC C3500 gets around 11 to 14 mpg if I cruise it real nice-like... also, make sure you go over THE WHOLE fuel system before you put a new carby on anything; clean fuel is a must!

texasfunk · 07-21-2009, 02:42 AM

getting about 9-10 in town with a 96' 355 vortec,has r/v cam, holley 750 double-pumper, and holley intake,

**78 Big10 454** · 07-21-2009, 02:43 AM

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

Keith Seymore · 07-21-2009, 12:20 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mph on a good day.
10 mph on a bad day
10 mph highway.
10 mph city.
10 mph empty.
10 mph loaded.

Did I miss anything?

Yes - 10 mpg with the engine shut off and coasting downhill.

K

olblue81 · 07-21-2009, 09:01 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mph on a good day.
10 mph on a bad day
10 mph highway.
10 mph city.
10 mph empty.
10 mph loaded.

Did I miss anything?

10 with a tailwind?

I can get 18 or so if I drive like a citizen. With the 3.07 gear and the OD the engine only runs 1600 at 62 mph (100km/h), so I usually run about 1800-1900 at that's 70-73 mph. That's with the converter locked up and no winds. Sounds silly, but a little wind here is 25 mph +.

Tater · 07-21-2009, 09:13 PM

Iget around 9mpg,less when my foot get's heavy
90 jimmy,mild 350,tbi,33" tires and 4.10 gears

tractor1963 · 07-21-2009, 09:15 PM

My 1989 TBI 1/2 ton Suburban 2wd,I get 15-16 going back and forth to work,taking it easy.My crewcab Dually,with 30 over 454,with towing cam,turbo 400w/ 4:10,Im getting about 9.5 empty,7.3 towing.My 2wd 4 banger Sonoma 5sp gets 28-30 driving to work and back

ghettoluxury · 07-22-2009, 12:31 AM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mph on a good day.
10 mph on a bad day
10 mph highway.
10 mph city.
10 mph empty.
10 mph loaded.

Did I miss anything?

Man you drive slow only 10 mph

sorry had to do it

Mine is a 454/rv cam/10 to 1 heads/600 eddy/th400/4:10 gears and like you it's only 6 mpg all the time no mater what I am using the old girl for.

Eyegore · 08-10-2009, 11:34 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

Yes :
10 mpg uphill
10 mpg downhill

Adams74Chevy · 08-14-2009, 11:59 AM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

Sounds like my father talking about my '74 K20 when people asked him what he got with it... after they'd have their OMG moment he'd calmly say well I bought it to haul not to drive to all over the countryside and it hauls as good as or better than these guys with their new trucks their still making payments on.

Scootin 81 C20 · 08-14-2009, 12:34 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

10 mpg during the day.
10 mpg at night.

Mine, if I did the math right, I get about 12 mpg with my 350 Quadrajet TH400. That is, if I can keep my foot out of it.

tecky11 · 08-16-2009, 04:55 AM

72 3/4 intl 2wd 3.73 3speed auto 9-10 if im nice 8-9 with lead foot

larrystone · 08-16-2009, 04:55 PM

21 mpg highway

Stock 4.3 4v/th350c/2.73/26" tall tires

RPOZ11 · 08-16-2009, 07:12 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

Same for me:

1973 Stock 454/TH400

Same results as above!!!

clinebarger · 08-17-2009, 02:26 PM

My 70 gets gallons per mile

my burb averages 16. the pickup 13. The biggest and heviest of my trucks my dodge dually gets the best 19-22.

Sniper X · 08-17-2009, 02:28 PM

Quote:

Originally Posted by 78 Big10 454

Stock 454 with a TH400:

10 mpg on a good day.
10 mpg on a bad day
10 mpg highway.
10 mpg city.
10 mpg empty.
10 mpg loaded.

Did I miss anything?

Sounds like mine, 1978 454 stock but for a good air filter and it gets 10mpg no matter what the situation is!

flamingbig10 · 07-21-2009, 02:47 AM

10 mpg is normal for a big block maybe 12 at best

texasfunk · 07-21-2009, 02:51 AM

my 81 with a 502 gets abt 10-12, r/v cam and MSD ignition with 650 eddy, thats about it on that one

gchemist · 07-21-2009, 03:51 AM

~13-15 in the city if I pamper it. Lead foot eats gas.
Best of 19.5 MPG at 70 MPH

ZZ4 355+ HP, 2500 stall, custom 700R4, 3.08, 255/60R15tires. A ton of body, engine and weight reduction work. Torque baby!!!

Keith Seymore · 07-21-2009, 08:27 AM

22 mpg on the highway; it's an 87 V6, 4 speed manual overdrive (I think it's a .70 or .73 overdrive) and 3.73 rear axle.

I haven't checked mileage around town.

K

jchav62 · 07-21-2009, 08:44 AM

I do about 2 gallons per mile..

No, but seriously, I haven't done a real calculation, but I can't be getting better than 10 mpg...

Mild 350, rv cam, headers, duals, 750 Edelbrock, th400, 3.73's...

I'll be switching to TBI in the near future. MPG's should improve.

07-21-2009, 01:51 AM	#1
Hazieview Building Dreams out of Dimes! Join Date: May 2005 Location: Bonham, Tx Posts: 892	What's your fuel Mileage? Just wondering how everyone was doing on fuel. So let us know what is your MPG and your setup. Thanks!

07-21-2009, 02:11 AM	#2
flamingbig10 6.0 powered square Join Date: Feb 2008 Location: Mesquite texas Posts: 3,459	Re: What's your fuel Mileage? I get about 5 to 8 in town that's with a sightly modified 350 with a junky quadra jet that's work wright very rarely also th350 and 373 gears __________________ Aaron 1980 c-10 short bed lowered, cammed 6.0, 4l80e 3600 stall, smp tune, wilwoods, and flames best time so far best et 7.86 @87 on motor 7.57 90 on a 75 shot Build http://67-72chevytrucks.com/vboard/s...d.php?t=283326 Last edited by flamingbig10; 07-21-2009 at 02:12 AM.

07-21-2009, 02:20 AM	#3
Orange77 Registered User Join Date: Apr 2009 Location: Tucson, AZ Posts: 184	Re: What's your fuel Mileage? why not swap it to a eddy and avoid probs?

07-21-2009, 02:37 AM	#4
flamingbig10 6.0 powered square Join Date: Feb 2008 Location: Mesquite texas Posts: 3,459	Re: What's your fuel Mileage? I had one but it was messed up by the past owner and was only getting 5 mpg on good day so got a rebuilt quadra jet and no luck couldn't get it tuned wright so I took it to a couple old school mechanics no luck it do good for a wile then next day it will bog down like crazy and spit and sputter, but I'm saving for a new carb so then I should be getting 8 or better __________________ Aaron 1980 c-10 short bed lowered, cammed 6.0, 4l80e 3600 stall, smp tune, wilwoods, and flames best time so far best et 7.86 @87 on motor 7.57 90 on a 75 shot Build http://67-72chevytrucks.com/vboard/s...d.php?t=283326 Last edited by flamingbig10; 07-21-2009 at 02:39 AM.

07-21-2009, 02:42 AM	#6
texasfunk Registered User Join Date: Jun 2009 Location: Lubbock, TX Posts: 1,671	Re: What's your fuel Mileage? getting about 9-10 in town with a 96' 355 vortec,has r/v cam, holley 750 double-pumper, and holley intake,

07-21-2009, 02:43 AM	#7
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 838	Re: What's your fuel Mileage? Stock 454 with a TH400: 10 mpg on a good day. 10 mpg on a bad day 10 mpg highway. 10 mpg city. 10 mpg empty. 10 mpg loaded. Did I miss anything? Last edited by 78 Big10 454; 07-22-2009 at 01:17 AM.

07-21-2009, 09:13 PM	#10
Tater Cradle Robber Join Date: May 2009 Location: Lily Lake,Illinois Posts: 774	Re: What's your fuel Mileage? Iget around 9mpg,less when my foot get's heavy 90 jimmy,mild 350,tbi,33" tires and 4.10 gears __________________ "The problem with the world is that everyone is a few drinks behind." Humphrey Bogart "Hippies.They're everywhere.They wanna save the earth,but all they do is smoke pot and smell bad."Eric Cartman "Think about how stupid the average person is,and realize half of them are stupider than that."George Carlin

07-21-2009, 09:15 PM	#11
tractor1963 Registered User Join Date: Oct 2008 Location: Lenoir,NC Posts: 159	Re: What's your fuel Mileage? My 1989 TBI 1/2 ton Suburban 2wd,I get 15-16 going back and forth to work,taking it easy.My crewcab Dually,with 30 over 454,with towing cam,turbo 400w/ 4:10,Im getting about 9.5 empty,7.3 towing.My 2wd 4 banger Sonoma 5sp gets 28-30 driving to work and back

08-16-2009, 04:55 AM	#16
tecky11 Registered User Join Date: Jan 2009 Location: phoenix,AZ Posts: 451	Re: What's your fuel Mileage? 72 3/4 intl 2wd 3.73 3speed auto 9-10 if im nice 8-9 with lead foot

08-16-2009, 04:55 PM	#17
larrystone Registered User Join Date: Jan 2008 Location: White Haven PA Posts: 59	Re: What's your fuel Mileage? 21 mpg highway Stock 4.3 4v/th350c/2.73/26" tall tires __________________ 1992 C1500 WT LWB 4.3TBI 700r4 4.10 limited slip= Work Truck 1986 C10 Custom Deluxe LWB 4.3-4V TH350C 2.73 ac cruise tilt= Cowboy Cadillac Last edited by larrystone; 08-16-2009 at 04:57 PM.

08-17-2009, 02:26 PM	#19
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: What's your fuel Mileage? My 70 gets gallons per mile my burb averages 16. the pickup 13. The biggest and heviest of my trucks my dodge dually gets the best 19-22.

07-21-2009, 02:47 AM	#21
flamingbig10 6.0 powered square Join Date: Feb 2008 Location: Mesquite texas Posts: 3,459	Re: What's your fuel Mileage? 10 mpg is normal for a big block maybe 12 at best __________________ Aaron 1980 c-10 short bed lowered, cammed 6.0, 4l80e 3600 stall, smp tune, wilwoods, and flames best time so far best et 7.86 @87 on motor 7.57 90 on a 75 shot Build http://67-72chevytrucks.com/vboard/s...d.php?t=283326

07-21-2009, 02:51 AM	#22
texasfunk Registered User Join Date: Jun 2009 Location: Lubbock, TX Posts: 1,671	Re: What's your fuel Mileage? my 81 with a 502 gets abt 10-12, r/v cam and MSD ignition with 650 eddy, thats about it on that one

07-21-2009, 03:51 AM	#23
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: What's your fuel Mileage? ~13-15 in the city if I pamper it. Lead foot eats gas. Best of 19.5 MPG at 70 MPH ZZ4 355+ HP, 2500 stall, custom 700R4, 3.08, 255/60R15tires. A ton of body, engine and weight reduction work. Torque baby!!! __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

07-21-2009, 08:27 AM	#24
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,207	Re: What's your fuel Mileage? 22 mpg on the highway; it's an 87 V6, 4 speed manual overdrive (I think it's a .70 or .73 overdrive) and 3.73 rear axle. I haven't checked mileage around town. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/



Register or Log In To remove these advertisements.

07-21-2009, 08:44 AM	#25
jchav62 1962 C-10 Join Date: Apr 2005 Location: Las Vegas, New Mexico Posts: 4,978	Re: What's your fuel Mileage? I do about 2 gallons per mile.. No, but seriously, I haven't done a real calculation, but I can't be getting better than 10 mpg... Mild 350, rv cam, headers, duals, 750 Edelbrock, th400, 3.73's... I'll be switching to TBI in the near future. MPG's should improve. __________________ Joseph Chavez "See the USA in a Chevrolet!!" ......................_____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1962 C10 Shortbed Fleetside 327/th350 GV overdrive 1974 C10 Longbed Fleetside 350/th350 "The Trash Truck" 1999 Chevy 2500 OBS, Longbed 5.7/4L80E 4x4 2015 GMC Sierra SLE 1500 4x4 Last edited by jchav62; 07-21-2009 at 08:45 AM.

Register or Log In To remove these advertisements.