What's your fuel Mileage? - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*C-10 simplex* · 08-10-2009, 10:35 AM

About 16ish mostly highway driving.

But for anyone serious about mpg, please read my very drawn out, thourough, anal, and scientific research thread on mpg:

http://forum.73-87chevytrucks.com/sm...p?topic=8474.0

P.S., i feel that tires could make all the difference in the world; i would be looking at michelin X.

Robert1970C20rstbukt · 08-10-2009, 04:24 PM

1984 Chevy regular cab flatbed dually, 454 with 2 1/2" dual exhaust and 12" chamber glasspacks(nice and LOUD

), stock air breather and Qjet, SM465, 4.10 gears, 235/85/16 rubber at 60psi. Right now I get about 6-7 in town and highway is close to 14, that's doin' around 50-55. Any higher and the gas gauge moves to the left real quick.

thirdstreettito · 08-10-2009, 10:13 PM

My diesel gets 22hwy, but I was doing 75-90, if I did 60-70 I'd probably get 25 easy.

Bow Tie Scottie · 08-10-2009, 10:27 PM

Why would you ask? O.K., my 86 gets about an average of 8 to 10. BTW, I hope the feds aren't looking.

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.

**nlped** · 08-14-2009, 02:08 PM

I average 14-16 mpg with mixed driving. I have gotten 18 mpg once on a road trip running 72 in the fall w/ no air running. '87 GMC 2wd w/ 350 TBI, 700r4, & 3.42 rear. But I had the stock 2.73 rearend when I got the 18 mpg.

Cheers,

Ed

*Stitch* · 08-14-2009, 09:36 PM

I get 26 city/22 highway

1/2ton swb 2wd, 6.2 diesel, 700r4, 3.42 gear...

and the injection pump is turned up some...go figure

KQQL IT · 08-15-2009, 04:42 PM

Hmmm when the gauge says 1/8th its time for more gas... I thought it was more about smiles per mile

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!

Manbearpig · 08-15-2009, 05:45 PM

About 5MPG in the K5

14 City/17 Highway in the 04 Sierra

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!

rome704 · 08-17-2009, 02:47 PM

50 feet 2 da gallon lol

more like 10 mpg

Sniper X · 08-17-2009, 02:57 PM

When I do get the clutch in the 74, Ill bet i get about the same as the big block! The 350 never was a great gas mileage monster in a C20...even with the 4 speed.

texastruckjunky · 08-18-2009, 02:04 AM

mine has a 454 with .505 lift cam. 1 over the RV cam. Headers 2 1/2 exhaust w/flowmasters and a factory Holly spreadbore carb. In town about 6-8 driving like grandpa. Hwy 9-11 55-60.

08-10-2009, 10:35 AM	#51
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: What's your fuel Mileage? About 16ish mostly highway driving. But for anyone serious about mpg, please read my very drawn out, thourough, anal, and scientific research thread on mpg: http://forum.73-87chevytrucks.com/sm...p?topic=8474.0 P.S., i feel that tires could make all the difference in the world; i would be looking at michelin X.

08-10-2009, 04:24 PM	#52
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Re: What's your fuel Mileage? 1984 Chevy regular cab flatbed dually, 454 with 2 1/2" dual exhaust and 12" chamber glasspacks(nice and LOUD ), stock air breather and Qjet, SM465, 4.10 gears, 235/85/16 rubber at 60psi. Right now I get about 6-7 in town and highway is close to 14, that's doin' around 50-55. Any higher and the gas gauge moves to the left real quick. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

08-10-2009, 10:13 PM	#53
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: What's your fuel Mileage? My diesel gets 22hwy, but I was doing 75-90, if I did 60-70 I'd probably get 25 easy. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

08-10-2009, 10:27 PM	#54
Bow Tie Scottie Registered User Join Date: Nov 2008 Location: Duluth, GA Posts: 80	Re: What's your fuel Mileage? Why would you ask? O.K., my 86 gets about an average of 8 to 10. BTW, I hope the feds aren't looking.

08-14-2009, 02:08 PM	#58
nlped Senior Member Join Date: Jul 2009 Location: Hayden, Al. Posts: 4,148	Re: What's your fuel Mileage? I average 14-16 mpg with mixed driving. I have gotten 18 mpg once on a road trip running 72 in the fall w/ no air running. '87 GMC 2wd w/ 350 TBI, 700r4, & 3.42 rear. But I had the stock 2.73 rearend when I got the 18 mpg. Cheers, Ed __________________ Carter 1968 Chevy SWB Fleet... Walt 1963-1/2 Ford Falcon Futura...Martha

08-14-2009, 09:36 PM	#59
Stitch Account Suspended Join Date: Jul 2008 Location: Where I come from, it's cornbread and chicken... Posts: 3,122	Re: What's your fuel Mileage? I get 26 city/22 highway 1/2ton swb 2wd, 6.2 diesel, 700r4, 3.42 gear... and the injection pump is turned up some...go figure

08-15-2009, 04:42 PM	#60
KQQL IT At the body shop. Join Date: Aug 2009 Location: Land of fruits and nuts. Posts: 5,259	Re: What's your fuel Mileage? Hmmm when the gauge says 1/8th its time for more gas... I thought it was more about smiles per mile __________________ " That didnt make it any newer " " Dont antique the equipment "

08-15-2009, 05:45 PM	#62
Manbearpig Registered User Join Date: Mar 2009 Location: Midland, Tx Posts: 418	Re: What's your fuel Mileage? About 5MPG in the K5 14 City/17 Highway in the 04 Sierra __________________ 1972 GMC C10

08-16-2009, 04:55 AM	#63
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	#64
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	#66
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.

08-17-2009, 02:47 PM	#68
rome704 Registered User Join Date: Feb 2009 Location: NC Posts: 85	Re: What's your fuel Mileage? 50 feet 2 da gallon lol more like 10 mpg __________________ Roman "LCPL" Planter The Few The Proud The Marines

08-17-2009, 02:57 PM	#69
Sniper X Registered User Join Date: Aug 2009 Location: Albuquerque New mexico Posts: 169	Re: What's your fuel Mileage? When I do get the clutch in the 74, Ill bet i get about the same as the big block! The 350 never was a great gas mileage monster in a C20...even with the 4 speed.

08-18-2009, 02:04 AM	#70
texastruckjunky Registered User Join Date: May 2009 Location: San Antonio,Texas Posts: 220	Re: What's your fuel Mileage? mine has a 454 with .505 lift cam. 1 over the RV cam. Headers 2 1/2 exhaust w/flowmasters and a factory Holly spreadbore carb. In town about 6-8 driving like grandpa. Hwy 9-11 55-60.

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