Went on the parkway today - The 1947 - Present Chevrolet & GMC Truck Message Board Network

77chevyinline6 · 02-11-2012, 06:35 PM

went on the parkway riding around in the freezing cold trying to figure out how good my truck is on gas i used a 1\8th of a tank on a 25-30 min drive is this good for a inline 6?

77chevyinline6 · 02-11-2012, 06:45 PM

edited

sethv · 02-11-2012, 07:02 PM

How many miles? And what size gas tank?

77chevyinline6 · 02-11-2012, 07:08 PM

i dont know how many miles but its the stock tank i think its around 10gal

**Palf70Step** · 02-11-2012, 07:33 PM

Tank should be 16 Gal. 1/8 of a tank would be about 2 gal used. Say 25-30 mins of driving is probably 25 to 30 miles....so my guess is about 13-15 MPG....depending on how accurate the gauge is. 15 Is about right for a 6 in these big trucks.. Some get better, some worse depending on a multitude of factors.

Altec · 02-11-2012, 07:40 PM

Top the tank off, drive around for a while recording your mileage with the Odometer (Or a GPS), top the tank back off, compare the miles you went to the fuel needed to fill it back up. That is your mileage.

The more miles you do the more accurate the number will be, and going back to the same pump can't hurt either...

Phillip Pennartz · 02-11-2012, 08:00 PM

is it long bed or short bed? I think long beds have 20 gallon tanks ,short have 16

You drove about 30 minutes I'm assuming at 60 mph so thats 30 miles

16 gallons divided by 1/8 is 2. 30miles divided by 2 gallons is 15mpg

20 divided by 1/8 is 2.5 30 miles divided by 2.5 is 12 mpg

I have heard these six motors get anything from 12 to 20 mpg
depending on gearing ,transmission type, speed, state of tune,
weather conditions ,old tired or fresh motor , how much junk in bed

oops I got to rambling,

your mileage sounds about right

good looking truck

Hoods69BadBowTie · 02-12-2012, 01:36 AM

Nice looking truck looks like you had fun cruising in it. Yea I have never had a v6 but like stated above I have heard of about 15-20 mpg depending on your lead foot and tune up haha.
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jitteryguy · 02-12-2012, 08:41 AM

Quote:

Originally Posted by Altec

Top the tank off, drive around for a while recording your mileage with the Odometer (Or a GPS), top the tank back off, compare the miles you went to the fuel needed to fill it back up. That is your mileage.

The more miles you do the more accurate the number will be, and going back to the same pump can't hurt either...

this is the only way to know, the gauge is only a rough estimate of how much fuel you have and will very as the tank empty's
an 1/8 out of full tank can very as much as gallon or compair'd to an 1/8 out of a 1/4 tank of fuel.

77chevyinline6 · 02-12-2012, 11:27 AM

Yeah i had alot of fun cruising around on it its a nice place up there had to go back early because of gas lol.

ProStreet83C10 · 02-12-2012, 12:07 PM

ive gotten 20 out of my modified 350 before with a 700R4 w/ 4.10s and 275/60R15s

beamn7 · 02-12-2012, 01:49 PM

Our 78 Scottsdale 10 has the 250 I6 (monojet), 3 on the tree and 3:42's outback and she's been averaging 16mpg since we picked her up in Detroit back in '78. 256,000 miles and never overhauled..... (yet)

77chevyinline6 · 02-13-2012, 10:50 AM

i think i might top it off this weekend and go back

02-11-2012, 06:35 PM	#1
77chevyinline6 Registered User Join Date: Dec 2011 Location: mount airy NC Posts: 308	Went on the parkway today went on the parkway riding around in the freezing cold trying to figure out how good my truck is on gas i used a 1\8th of a tank on a 25-30 min drive is this good for a inline 6? Attached Images __________________ 77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator.

02-11-2012, 06:45 PM	#2
77chevyinline6 Registered User Join Date: Dec 2011 Location: mount airy NC Posts: 308	Re: Went on the parkway today edited Attached Images __________________ 77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator.

02-11-2012, 07:02 PM	#3
sethv Registered User Join Date: May 2011 Location: Bradford, PA Posts: 395	Re: Went on the parkway today How many miles? And what size gas tank? __________________ 1981 K10 Scottsdale 305 ci \| TH350 \| NP208 \| 60k miles

02-11-2012, 07:08 PM	#4
77chevyinline6 Registered User Join Date: Dec 2011 Location: mount airy NC Posts: 308	Re: Went on the parkway today i dont know how many miles but its the stock tank i think its around 10gal __________________ 77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator.

02-11-2012, 07:33 PM	#5
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,761	Re: Went on the parkway today Tank should be 16 Gal. 1/8 of a tank would be about 2 gal used. Say 25-30 mins of driving is probably 25 to 30 miles....so my guess is about 13-15 MPG....depending on how accurate the gauge is. 15 Is about right for a 6 in these big trucks.. Some get better, some worse depending on a multitude of factors. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

02-11-2012, 07:40 PM	#6
Altec Getcha Pull Join Date: Nov 2010 Location: MD Posts: 691	Re: Went on the parkway today Top the tank off, drive around for a while recording your mileage with the Odometer (Or a GPS), top the tank back off, compare the miles you went to the fuel needed to fill it back up. That is your mileage. The more miles you do the more accurate the number will be, and going back to the same pump can't hurt either... __________________ '81 K10 454/SM465 '86 S10 Blazer '95 H-D Softail '96 Integra

02-11-2012, 08:00 PM	#7
Phillip Pennartz Registered User Join Date: Jun 2000 Location: Wichita Falls,Tx Posts: 56	Re: Went on the parkway today is it long bed or short bed? I think long beds have 20 gallon tanks ,short have 16 You drove about 30 minutes I'm assuming at 60 mph so thats 30 miles 16 gallons divided by 1/8 is 2. 30miles divided by 2 gallons is 15mpg 20 divided by 1/8 is 2.5 30 miles divided by 2.5 is 12 mpg I have heard these six motors get anything from 12 to 20 mpg depending on gearing ,transmission type, speed, state of tune, weather conditions ,old tired or fresh motor , how much junk in bed oops I got to rambling, your mileage sounds about right good looking truck

02-12-2012, 01:36 AM	#8
Hoods69BadBowTie Chevys Kick A$$ Join Date: Jan 2005 Location: Zootown, MT Posts: 12,699	Re: Went on the parkway today Nice looking truck looks like you had fun cruising in it. Yea I have never had a v6 but like stated above I have heard of about 15-20 mpg depending on your lead foot and tune up haha. Posted via Mobile Device __________________ HOODS is what I answer too -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER I would rather push a Chevy then drive a ford!!

02-12-2012, 11:27 AM	#10
77chevyinline6 Registered User Join Date: Dec 2011 Location: mount airy NC Posts: 308	Re: Went on the parkway today Yeah i had alot of fun cruising around on it its a nice place up there had to go back early because of gas lol. __________________ 77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator.

02-12-2012, 12:07 PM	#11
ProStreet83C10 Drag Racer Join Date: Nov 2006 Location: Mason City, Iowa Posts: 1,276	Re: Went on the parkway today ive gotten 20 out of my modified 350 before with a 700R4 w/ 4.10s and 275/60R15s __________________ Zach Hall 1983 Chevy C10 R/T: .194 60': 2.322 330: 6.379 1/8: 9.803 MPH: 71.37 1000: 12.781 1/4: 15.314 MPH: 88.79

02-12-2012, 01:49 PM	#12
beamn7 Registered User Join Date: Oct 2011 Location: Wildomar, CA Posts: 466	Re: Went on the parkway today Our 78 Scottsdale 10 has the 250 I6 (monojet), 3 on the tree and 3:42's outback and she's been averaging 16mpg since we picked her up in Detroit back in '78. 256,000 miles and never overhauled..... (yet)

02-13-2012, 10:50 AM	#13
77chevyinline6 Registered User Join Date: Dec 2011 Location: mount airy NC Posts: 308	Re: Went on the parkway today i think i might top it off this weekend and go back __________________ 77 c10 (went from a inline 6 to 350) (converted to 3 speed in the floor) 350: mild cam, holley 600cfm 4bbl, summit stage 1 intake, accel billet distributer, flowtech headers, 2 1/4" exhaust with glasspacks, powermaster 160a alternator.



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