What's your fuel Mileage? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MoFaster · 07-21-2009, 07:38 PM

Around 3 or 4 with a 402, tunnel ram, and 2 600 hollys not sure with tha predators.

MoFaster · 07-21-2009, 07:49 PM

Around 3 or 4 with a 402, tunnel ram, and 2 600 hollys not sure with tha predators.

mongoose · 07-21-2009, 07:57 PM

Quote:

Originally Posted by swb85

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!

how many rpm's are you turning on the highway?

strick9c10 · 07-21-2009, 08:32 PM

1979 C-10 long box... modified 355 pushing 425 hp, with a 4 speed currently. When "grannying" it & cruising, have achieved a personal best of 18.7 mpg.

When hammering it, going through a set of rear tires in an evening, and filling out environmental impact statements, have achieved a personal best of 4.8 mpg.

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

Justins76 · 07-22-2009, 12:07 AM

8-10mph mixed city/hwy. 350 4bbl and th350 w/ 3.42 (29" tires)

Gregs71 · 07-22-2009, 12:18 AM

my 87 3/4 ton 4x4 tbi w/ a tired 350/th400/4.10 gears is 8 mpg and that is driving nice.

my 89 1 ton crewcab dually 4x4 tbi w/ freshly built 454 rv cam / th400/4.10 gears is 8 avg and 10 if i baby it.

3r!c84 · 07-22-2009, 12:30 AM

umm more like 12-13 mostly city
even with a 305 but a th350 and a 3.42 gear

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.

**78 Big10 454** · 07-22-2009, 01:19 AM

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

Good catch, Keith!

D13 · 07-22-2009, 06:01 AM

87 1/2 ton w/topper, 6.2 diesel/700R4 and I believe 3.08's, 24mpg mixed (it's 37 miles 1 way to work, dirt, paved country, 4 lane expressway, and 5 miles of 6 lane city roads).

swb85 · 07-22-2009, 09:14 AM

Quote:

Originally Posted by mongoose

how many rpm's are you turning on the highway?

2700rpm @ 70mph

The Pool Guy · 08-09-2009, 09:02 PM

13.8 city 17.8 hwy last long trip.
85 longbed c10 with 305ci 700r4
i run lucas in the oil. every other tank i use lucas

TwoFiftyShifter · 08-09-2009, 09:22 PM

What do you think my new rig will pull mpg? 87 350TBI 3/4ton, sm465 creeper box and either 3.73 or 4.10 gears..... at 60-65mph on the highway. Can I hope for 12-14?

1985-GMC · 08-09-2009, 09:48 PM

1983 single cab dually, 454 hiped up a little, stock quadrajunk, sm465, 4.10 gears, manifolds, 2 1/2" duals, 3" tips, 9" glass packs, CB radio

7-8 in the hill country
13 if i go easy on it

manimal · 08-09-2009, 10:23 PM

Yesterday I got 13.5 @ 70mph with the air on in my '84 crewcab w/454/TH400/14blt 3.73 and 265x75x16's...
-Lance

79Silv4x4 · 08-09-2009, 11:20 PM

Quote:

Originally Posted by swb85

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!

17 with no o/d?

thirdstreettito · 08-09-2009, 11:21 PM

So far I win with best mileage.

INSIDIOUS '86 · 08-10-2009, 06:08 AM

not so fast third street!

i get 17mpg city depending on how heavy my foot is and 20mpg highway
i have 86 scottsdale with 305/700r4 and 2:73 gears. goin nowere fast in this thing

GMC91 · 08-10-2009, 06:42 AM

83 305 HO with a screwed up 700R4 and Holley 600 4-barrel. Best is 15 MPG mostly 12-13 MPG cause my right foot.

Keith Seymore · 08-10-2009, 07:09 AM

Quote:

Originally Posted by thirdstreettito

So far I win with best mileage.

Quote:

Originally Posted by INSIDIOUS '86

not so fast third street!

i get 17mpg city depending on how heavy my foot is and 20mpg highway
i have 86 scottsdale with 305/700r4 and 2:73 gears. goin nowere fast in this thing

Nuh-uh guys - I said 22 mph with my little V6 and manual overdrive!

D13 · 08-10-2009, 07:51 AM

And you better check out my diesel numbers! Get 22mpg with bad pump and heavy foot LOL! Taking it easy is 24mpg no problemo.

Next build is 82 1/2 ton 3.08's 250L6 with A-833 like Keith's. I drive like a little old lady so I bet I can get 22mpg out of it! If not than I'll swap in my 194 Nova motor and toss on TBI. That'll get ya!

*78 Chevyrado* · 08-10-2009, 08:45 AM

I was getting around 15-16mpg Hwy before they imposed crap E10 gas on us, now I get 10-12mpg HWY. The truck never runs quite right now since it has no computer and seems to need to be recalibrated slightly for each tank of gas, since the gas is never the same from tank to tank.

78 c20, 350sb th400 3.73 rear end. 4950lbs.

I don't list what I used to get in my '87 since everybody always calls BS.

07-21-2009, 07:38 PM	#26
MoFaster Registered User Join Date: Jan 2009 Location: San Antonio, Tx Posts: 38	Re: What's your fuel Mileage? Around 3 or 4 with a 402, tunnel ram, and 2 600 hollys not sure with tha predators. __________________ 78 Stepper Big Block http://i62.photobucket.com/albums/h1...19-09_1639.jpg *Dont brake till you see God!!*

07-21-2009, 07:49 PM	#27
MoFaster Registered User Join Date: Jan 2009 Location: San Antonio, Tx Posts: 38	Re: What's your fuel Mileage? Around 3 or 4 with a 402, tunnel ram, and 2 600 hollys not sure with tha predators. __________________ 78 Stepper Big Block http://i62.photobucket.com/albums/h1...19-09_1639.jpg *Dont brake till you see God!!*

07-21-2009, 08:32 PM	#29
strick9c10 Registered User Join Date: Mar 2009 Location: Mid-Coast Maine Posts: 33	What's your fuel Mileage? 1979 C-10 long box... modified 355 pushing 425 hp, with a 4 speed currently. When "grannying" it & cruising, have achieved a personal best of 18.7 mpg. When hammering it, going through a set of rear tires in an evening, and filling out environmental impact statements, have achieved a personal best of 4.8 mpg.

07-21-2009, 09:13 PM	#31
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	#32
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

07-22-2009, 12:07 AM	#33
Justins76 OutOfMyMind & I'llNeverKnowWhy Join Date: Apr 2004 Location: Another world, some other time Posts: 672	Re: What's your fuel Mileage? 8-10mph mixed city/hwy. 350 4bbl and th350 w/ 3.42 (29" tires) __________________ -Justin-Out of my mind and I'll never know why 1976 Chevrolet Silverado C10 350 4bbl / TH350 Big10 longbed 1986 Pontiac Firebird T-Top 5.0L TPI 700R4 WS6 1992 Pontiac Firebird T-Top 5.0L TBI 700R4 My cardomain page I don't like to save, it's more fun to spend!!

07-22-2009, 12:18 AM	#34
Gregs71 Registered User Join Date: Nov 2006 Location: Amador County, Ca. Posts: 229	Re: What's your fuel Mileage? my 87 3/4 ton 4x4 tbi w/ a tired 350/th400/4.10 gears is 8 mpg and that is driving nice. my 89 1 ton crewcab dually 4x4 tbi w/ freshly built 454 rv cam / th400/4.10 gears is 8 avg and 10 if i baby it. __________________ 1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400

07-22-2009, 12:30 AM	#35
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: What's your fuel Mileage? umm more like 12-13 mostly city even with a 305 but a th350 and a 3.42 gear __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

07-22-2009, 01:19 AM	#37
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 838	Re: What's your fuel Mileage? 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 Good catch, Keith!

07-22-2009, 06:01 AM	#38
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: What's your fuel Mileage? 87 1/2 ton w/topper, 6.2 diesel/700R4 and I believe 3.08's, 24mpg mixed (it's 37 miles 1 way to work, dirt, paved country, 4 lane expressway, and 5 miles of 6 lane city roads). __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

08-09-2009, 09:02 PM	#40
The Pool Guy Registered User Join Date: Aug 2009 Location: Palm Springs, CA Posts: 36	Re: What's your fuel Mileage? 13.8 city 17.8 hwy last long trip. 85 longbed c10 with 305ci 700r4 i run lucas in the oil. every other tank i use lucas

08-09-2009, 09:22 PM	#41
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: What's your fuel Mileage? What do you think my new rig will pull mpg? 87 350TBI 3/4ton, sm465 creeper box and either 3.73 or 4.10 gears..... at 60-65mph on the highway. Can I hope for 12-14? __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

08-09-2009, 09:48 PM	#42
1985-GMC Chevy Enthusiast Join Date: Jul 2009 Location: Canyon Lake Texas Posts: 2,024	Re: What's your fuel Mileage? 1983 single cab dually, 454 hiped up a little, stock quadrajunk, sm465, 4.10 gears, manifolds, 2 1/2" duals, 3" tips, 9" glass packs, CB radio 7-8 in the hill country 13 if i go easy on it

08-09-2009, 10:23 PM	#43
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: What's your fuel Mileage? Yesterday I got 13.5 @ 70mph with the air on in my '84 crewcab w/454/TH400/14blt 3.73 and 265x75x16's... -Lance __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

08-09-2009, 11:21 PM	#45
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: What's your fuel Mileage? So far I win with best mileage. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck



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08-10-2009, 06:08 AM	#46
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: What's your fuel Mileage? not so fast third street! i get 17mpg city depending on how heavy my foot is and 20mpg highway i have 86 scottsdale with 305/700r4 and 2:73 gears. goin nowere fast in this thing

08-10-2009, 06:42 AM	#47
GMC91 Always trouble Join Date: Jul 2009 Location: Hartsellle, Al Posts: 1,111	Re: What's your fuel Mileage? 83 305 HO with a screwed up 700R4 and Holley 600 4-barrel. Best is 15 MPG mostly 12-13 MPG cause my right foot. __________________ 91 Silverado Regular cab, 2wd, swb-project truck 97 Silverado Extended cab, 2wd, swb-driver

08-10-2009, 07:51 AM	#49
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: What's your fuel Mileage? And you better check out my diesel numbers! Get 22mpg with bad pump and heavy foot LOL! Taking it easy is 24mpg no problemo. Next build is 82 1/2 ton 3.08's 250L6 with A-833 like Keith's. I drive like a little old lady so I bet I can get 22mpg out of it! If not than I'll swap in my 194 Nova motor and toss on TBI. That'll get ya! __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

08-10-2009, 08:45 AM	#50
78 Chevyrado Account Suspended Join Date: Dec 2007 Location: Unnapreciative, Trollville Posts: 2,079	Re: What's your fuel Mileage? I was getting around 15-16mpg Hwy before they imposed crap E10 gas on us, now I get 10-12mpg HWY. The truck never runs quite right now since it has no computer and seems to need to be recalibrated slightly for each tank of gas, since the gas is never the same from tank to tank. 78 c20, 350sb th400 3.73 rear end. 4950lbs. I don't list what I used to get in my '87 since everybody always calls BS. Last edited by 78 Chevyrado; 08-10-2009 at 06:03 PM.

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