I went for a MPG cruise yesterday - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pritch · 06-20-2011, 10:21 PM

And I got some good news! Over 16!

I drove 113 miles, about half and half freeway and windy mountain canyon, with a couple miles of dirt road thrown in. On 6.6 gallons. I know that figures out to 17.12, but my odie is a little slow, about a tenth in 2 miles, so I figured about about 107 miles. That's 16.21.

(a tenth in 2 miles-1/2 of total=56. 56 x .1 = 5.6. 113-5.6=107.4. round down to 107 miles divided by 6.6=16.21

'68 long bed, 250 4 speed. And I was doing 65-70 on the freeway and 50 or so in the canyons.

I think that is pretty good for this old truck!

**Boog** · 06-20-2011, 10:26 PM

That ain't bad at all.

Longhorn Man · 06-20-2011, 10:30 PM

C/10 or C/20?
What was your freeway speed?
Stock gear? Standard gear?
Sounds great.

pritch · 06-20-2011, 10:42 PM

Quote:

Originally Posted by Longhorn Man

C/10 or C/20?
What was your freeway speed?
Stock gear? Standard gear?
Sounds great.

It's a C/10. 65-70 on the freeway-it's mostly flat and 50's in the canyons-very steep and windy. I don't know what 4 speed it is, probably whatever came stock, but I know it has 3.73's in the rear end.

I was hoping for more than 10, but I never expected 16. I always like to check milage, so I'll be keeping an eye on it.

lil hoodlum · 06-20-2011, 10:51 PM

Wow congratulations. I wish I could get that kinda gas mileage.

I bet you had fun just cruising around!

Keith

oldblue1968chevy · 06-20-2011, 11:13 PM

wow thats good, ya think about it the newer trucks advertise 16 or around that number in town and maybe 20 on highway (thats with 40 years of enginerring)

QKENUF4U · 06-20-2011, 11:29 PM

good ol straight 6

Zoomin · 06-21-2011, 12:23 AM

Quote:

Originally Posted by pritch

It's a C/10. 65-70 on the freeway-it's mostly flat and 50's in the canyons-very steep and windy. I don't know what 4 speed it is, probably whatever came stock, but I know it has 3.73's in the rear end.

I was hoping for more than 10, but I never expected 16. I always like to check milage, so I'll be keeping an eye on it.

Downhill with tailwind?

Indyuke · 06-21-2011, 12:57 AM

Yeah, yeah. All you guys making me jealous with your 6 bangers. And here I have to put up with a 350CID/700R4. One of these days I gotta toss my setup out in favor of a 250 or 292.

Longhorn Man · 06-21-2011, 08:56 AM

i got 14... or maybe it was 16 in my big block burb for about 1/3 of the trip cross country when I bought it.
It had a bunch of wiped cam lobes and bent intake pushrods, so the valves weren't opening as much as they should have (still hit on all 8) and the throttle cable was messed up and I could only get 1/2 throttle... I'm sure those two conditions helped a LOT!

brad_man_72 · 06-21-2011, 01:22 PM

Quote:

Originally Posted by oldblue1968chevy

wow thats good, ya think about it the newer trucks advertise 16 or around that number in town and maybe 20 on highway (thats with 40 years of enginerring)

same mpg double the hp. Just if you want to compare apples to apples

not that max hp matters if you're just using 1/3 of it cruising around.

68 IRON · 06-21-2011, 01:41 PM

16?!? Thats pretty good. Lets see the setup again...please post a pic!

Matt67C10 · 06-21-2011, 02:36 PM

That's great. I have a 250cid with a 3-speed and only get about 12. Mine is screaming at 65, I rarely take it over 60 on the highway. Your mileage is pretty good!

VA72C10 · 06-21-2011, 02:59 PM

Sounds impressive!

Just make sure you average out your mileage...with old fuel gauges and an off-speedo the numbers are far from reliable. Over a few fill-ups you'll have a better idea of true mileage.

I had a VW new beetle TDI and averaged around 35mpg. I got 70mpg one time measuring mileage this way (one tank) on a 100 mile trip on interstate....

68Stepbed · 06-21-2011, 03:36 PM

Pretty good for a 6-banger. My cammed 350/TH350 with 3.73's averaged 14mpg. I just switched to 3.07 gears, so I'm hoping for 16ish.

pritch · 06-21-2011, 10:00 PM

Quote:

Originally Posted by 68 IRON

16?!? Thats pretty good. Lets see the setup again...please post a pic!

Well OK...if you twist my arm

Just a plain jane green truck:

With a plain jane 250:

All I have done is add power brakes and HEI. Oh, and a better valve cover than what was on it. That I didn't get sealed very well.

06-20-2011, 10:21 PM	#1
pritch Registered User Join Date: Mar 2004 Location: Hoytsville, Utah Posts: 3,365	I went for a MPG cruise yesterday And I got some good news! Over 16! I drove 113 miles, about half and half freeway and windy mountain canyon, with a couple miles of dirt road thrown in. On 6.6 gallons. I know that figures out to 17.12, but my odie is a little slow, about a tenth in 2 miles, so I figured about about 107 miles. That's 16.21. (a tenth in 2 miles-1/2 of total=56. 56 x .1 = 5.6. 113-5.6=107.4. round down to 107 miles divided by 6.6=16.21 '68 long bed, 250 4 speed. And I was doing 65-70 on the freeway and 50 or so in the canyons. I think that is pretty good for this old truck! __________________ '68 Panel Project Boogie Chillin' '68 C-10 Ol' Green

06-20-2011, 10:26 PM	#2
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,368	Re: I went for a MPG cruise yesterday That ain't bad at all. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

06-20-2011, 10:30 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: I went for a MPG cruise yesterday C/10 or C/20? What was your freeway speed? Stock gear? Standard gear? Sounds great.

06-20-2011, 10:51 PM	#5
lil hoodlum Registered User Join Date: Oct 2009 Location: Denton, Texas Posts: 1,729	Re: I went for a MPG cruise yesterday Wow congratulations. I wish I could get that kinda gas mileage. I bet you had fun just cruising around! Keith

06-20-2011, 11:13 PM	#6
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: I went for a MPG cruise yesterday wow thats good, ya think about it the newer trucks advertise 16 or around that number in town and maybe 20 on highway (thats with 40 years of enginerring) __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

06-20-2011, 11:29 PM	#7
QKENUF4U Senior Member Join Date: Jan 2005 Location: SUNNY WARM BIKE RIDING COTTONWOOD ARIZONA Posts: 2,097	Re: I went for a MPG cruise yesterday good ol straight 6

06-21-2011, 12:57 AM	#9
Indyuke Registered User Join Date: Feb 2008 Location: Lake Stevens, WA Posts: 623	Re: I went for a MPG cruise yesterday Yeah, yeah. All you guys making me jealous with your 6 bangers. And here I have to put up with a 350CID/700R4. One of these days I gotta toss my setup out in favor of a 250 or 292.

06-21-2011, 08:56 AM	#10
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: I went for a MPG cruise yesterday i got 14... or maybe it was 16 in my big block burb for about 1/3 of the trip cross country when I bought it. It had a bunch of wiped cam lobes and bent intake pushrods, so the valves weren't opening as much as they should have (still hit on all 8) and the throttle cable was messed up and I could only get 1/2 throttle... I'm sure those two conditions helped a LOT!

06-21-2011, 01:41 PM	#12
68 IRON Registered User Join Date: Sep 2010 Location: Olympia, WA Posts: 736	Re: I went for a MPG cruise yesterday 16?!? Thats pretty good. Lets see the setup again...please post a pic!

06-21-2011, 02:36 PM	#13
Matt67C10 Registered User Join Date: Jun 2005 Location: Slatington, PA Posts: 536	Re: I went for a MPG cruise yesterday That's great. I have a 250cid with a 3-speed and only get about 12. Mine is screaming at 65, I rarely take it over 60 on the highway. Your mileage is pretty good! __________________ 67 C10 LWB Stepside- 250cid 6, 3speed

06-21-2011, 02:59 PM	#14
VA72C10 VA72C10 Join Date: Mar 2008 Location: Midlothian, VA Posts: 25,269	Re: I went for a MPG cruise yesterday Sounds impressive! Just make sure you average out your mileage...with old fuel gauges and an off-speedo the numbers are far from reliable. Over a few fill-ups you'll have a better idea of true mileage. I had a VW new beetle TDI and averaged around 35mpg. I got 70mpg one time measuring mileage this way (one tank) on a 100 mile trip on interstate.... __________________ Looking for a 67-72 swb or blazer project in or around VA.

06-21-2011, 03:36 PM	#15
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: I went for a MPG cruise yesterday Pretty good for a 6-banger. My cammed 350/TH350 with 3.73's averaged 14mpg. I just switched to 3.07 gears, so I'm hoping for 16ish. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system



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