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

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?

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.

glock35ipsc · 07-21-2009, 08:46 AM

Best of 15.6 mixed driving. ~30,000 mile 1991 355, all stock with TBI, TH350 and 2.73's.

The winter that will be changing to a 5.3L Vortec, 4L60E and 3.42's.

pokethesmot · 07-21-2009, 09:18 AM

about 8 or 10 in town and about 10 or 12 on the highway

tomtuna1978 · 07-21-2009, 09:34 AM

i get 30 in town and 40 on the highway if i keep her under 70mph... in the 08 honda fit... lol... the truck isnt done yet

so i dont know what i get with it !

swb85 · 07-21-2009, 09:57 AM

383ci, 750cfm edel carb, m21 4 speed, 3.42 gears and 28" tall tires. I usually average around 15-16mpg mixed hwy/city. Usually around 17 on the highway. I bet I could break 20 with an overdrive!

78BO · 07-21-2009, 10:02 AM

Count me in, I get about 8mpg. 383/350/373gears. I wished I would have just saved for a 700r4.....

pokethesmot · 07-21-2009, 10:14 AM

i forgot to add my specs i have a 400 small block 350 tranny and 4:10 ratio

1981C10LWB · 07-21-2009, 11:15 AM

Best of 11.9 MPG
Average of about 10.5 MPG
Mixed driving with majority around 50-60 mph

~5,000 mile rebuilt 1989 350: aluminum intake, 600 cfm edelbrock, headers, mild cam. TH350. Unknown rear gear. 28 inch tire

Electric fans coming soon!

thirdstreettito · 07-21-2009, 12:05 PM

6.2 Diesel/700R4/NP208/3:42 pegleg

22 highway
17-20 city

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

Driveway Dreams · 07-21-2009, 12:35 PM

7-9 around town last I checked. Have since changed my rear end and tires. I think it improved a little...I might be up to 8-10 in town now!

I have an old 350, super low 4 speed, unknown rear gears, on 245/60/15s.

83burban · 07-21-2009, 12:44 PM

350 with RV cam / 700r4 / 3.42 gears
8-10 City
15 Hwy
Averaged 19 when I drove cross country drafting semi's

This is also with an 83 Suburban

Alex1 · 07-21-2009, 01:12 PM

454 with Edelbrock perf rpm with Holley 750 cfm and headers, th400

8-10 MPG - If I beat on it, 4-5 MPG, maybe less. NASTY.

Driveway Dreams · 07-21-2009, 03:42 PM

And people ask us how we can drive them all the time.

CoggedBelt75 · 07-21-2009, 07:28 PM

Around town, no hard numbers, it varies from descent to terrible, depending on which gear I stay in and how light or heavy my right foot becomes at any given time. On the highway, most I could get out of a 120 mile trip was 10 mpg. But, if I was concerned about mileage, I sure wouldn't have built this particular engine

....671 blown and injected 383, manual/reverse TH 400 with brake, 4.56 rear with 31" tires.

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	#5
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	#6
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, 02:47 AM	#7
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	#8
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	#9
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	#10
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,167	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/

07-21-2009, 08:44 AM	#11
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.

07-21-2009, 08:46 AM	#12
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,685	Re: What's your fuel Mileage? Best of 15.6 mixed driving. ~30,000 mile 1991 355, all stock with TBI, TH350 and 2.73's. The winter that will be changing to a 5.3L Vortec, 4L60E and 3.42's. __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE Last edited by glock35ipsc; 07-21-2009 at 08:46 AM.

07-21-2009, 09:18 AM	#13
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	Re: What's your fuel Mileage? about 8 or 10 in town and about 10 or 12 on the highway __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

07-21-2009, 09:34 AM	#14
tomtuna1978 Registered User Join Date: Apr 2009 Location: Bend,Oregon Posts: 225	Re: What's your fuel Mileage? i get 30 in town and 40 on the highway if i keep her under 70mph... in the 08 honda fit... lol... the truck isnt done yet so i dont know what i get with it !

07-21-2009, 09:57 AM	#15
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: What's your fuel Mileage? 383ci, 750cfm edel carb, m21 4 speed, 3.42 gears and 28" tall tires. I usually average around 15-16mpg mixed hwy/city. Usually around 17 on the highway. I bet I could break 20 with an overdrive! __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD



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07-21-2009, 10:02 AM	#16
78BO Registered User Join Date: May 2008 Location: Austin TX Posts: 531	Re: What's your fuel Mileage? Count me in, I get about 8mpg. 383/350/373gears. I wished I would have just saved for a 700r4.....

07-21-2009, 10:14 AM	#17
pokethesmot profeshinaly unimployed Join Date: Dec 2008 Location: hazlehurst, GA Posts: 1,232	Re: What's your fuel Mileage? i forgot to add my specs i have a 400 small block 350 tranny and 4:10 ratio __________________ my ride click here my myspace "having mud flaps is like asking for a smaller trophy"

07-21-2009, 11:15 AM	#18
1981C10LWB Registered User Join Date: May 2009 Location: Houston, TX Posts: 30	Re: What's your fuel Mileage? Best of 11.9 MPG Average of about 10.5 MPG Mixed driving with majority around 50-60 mph ~5,000 mile rebuilt 1989 350: aluminum intake, 600 cfm edelbrock, headers, mild cam. TH350. Unknown rear gear. 28 inch tire Electric fans coming soon! __________________ 1981 C10 LWB – 350/TH350 – Work In Progress – 1st Vehicle

07-21-2009, 12:05 PM	#19
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: What's your fuel Mileage? 6.2 Diesel/700R4/NP208/3:42 pegleg 22 highway 17-20 city __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

07-21-2009, 12:35 PM	#21
Driveway Dreams I have car A.D.D. Join Date: Feb 2009 Location: Greeley, Northern Colorado Posts: 4,147	Re: What's your fuel Mileage? 7-9 around town last I checked. Have since changed my rear end and tires. I think it improved a little...I might be up to 8-10 in town now! I have an old 350, super low 4 speed, unknown rear gears, on 245/60/15s. __________________ -Gerald Building vehicles in memory of the first "car guy" I ever knew, my Grandpa. Bob Dunham 1935-2009. Rest in peace. 61 GMC Suburban SOLD The 86 build thread SOLD Are you a Colorado member?Click here.

07-21-2009, 12:44 PM	#22
83burban Registered User Join Date: Feb 2008 Location: la Posts: 345	Re: What's your fuel Mileage? 350 with RV cam / 700r4 / 3.42 gears 8-10 City 15 Hwy Averaged 19 when I drove cross country drafting semi's This is also with an 83 Suburban

07-21-2009, 01:12 PM	#23
Alex1 Registered User Join Date: Jul 2007 Location: Ottawa Ontario Canada Posts: 1,156	Re: What's your fuel Mileage? 454 with Edelbrock perf rpm with Holley 750 cfm and headers, th400 8-10 MPG - If I beat on it, 4-5 MPG, maybe less. NASTY.

07-21-2009, 03:42 PM	#24
Driveway Dreams I have car A.D.D. Join Date: Feb 2009 Location: Greeley, Northern Colorado Posts: 4,147	Re: What's your fuel Mileage? And people ask us how we can drive them all the time. __________________ -Gerald Building vehicles in memory of the first "car guy" I ever knew, my Grandpa. Bob Dunham 1935-2009. Rest in peace. 61 GMC Suburban SOLD The 86 build thread SOLD Are you a Colorado member?Click here.

07-21-2009, 07:28 PM	#25
CoggedBelt75 Registered User Join Date: Nov 2008 Location: Altus, Oklahoma Posts: 679	Re: What's your fuel Mileage? Around town, no hard numbers, it varies from descent to terrible, depending on which gear I stay in and how light or heavy my right foot becomes at any given time. On the highway, most I could get out of a 120 mile trip was 10 mpg. But, if I was concerned about mileage, I sure wouldn't have built this particular engine....671 blown and injected 383, manual/reverse TH 400 with brake, 4.56 rear with 31" tires.

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