need ideas for good gas milage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Wojo · 02-10-2003, 01:11 AM

Guys,
I'm driving this rusty 75C10 with in line six and factory Rochester carburator and 3 speed automatic tranny..........getting 16 mpg street/hwy
What's the best idea for good gas milage setup ?
Don't care about the power, just want to have this truck for everyday driving. I will be happy with 20mpg or better.

Would aftermarket carburator make a difference ??
How about getting new motor and tranny and carburator ..........

Wojo

Trick76 · 02-10-2003, 01:23 AM

Step 1: Walk to local Chevrolet dealer

Step 2: Buy new S10

Step 3: Enjoy 25-30 MPG!

lol j/k

16 MPG isn't all that bad I would be happy with that

Wojo · 02-10-2003, 01:33 AM

.............

don't have any problems with step 1 and 3......step 2 is unfortunatelly out of the questions.
....the thing is that I just absolutely LOVE my C10...we were bonded for live........

plus she is 100% paid for

gchemist · 02-10-2003, 02:42 AM

Get one of these.

The I-6 would really like the addition. The tailgate is really a gas milage killa.

79BIG10 · 02-10-2003, 03:11 AM

If you don't have a high gear ration (3.07 or lower numerically) this would be a good time to get them replaced. These are good highway gears but not best for off the line and towing which I bet you won't be doing much with the I-6.

**tkeduk8r** · 02-10-2003, 03:11 AM

hey, just wanted to pass along that that kinda milage aint that bad for the inline... I have a 74 c10 250-6 and htree on tree 3.73 gears and 30.5 tires and get around 13city/16highway, and ive tried every trick in the book to bring it up... I had a 80 k5 blazer with same gearing 31's and 3sp/creeper and got 19-20 hwy... BUT until yesterday reading through doug roe's rochester carb book, the carbs were different and that could be the prollem... our rochester monojets were great simple carbs buthte dual jets gm put on em in later years were actually better on gas... NOW ive gone through the trouble of blueprinting my carb, a valve job, all new hoses, sandblasted and painted intake/exhaust manifolds, HEI (with all new delco plugs, cap rotor etc), 24 in/Hg vacuum, new exhaust with 2.25" dia pipe, all in the search for htose few precious more miles per gallon... but i cant seem to squeeze any more out of it... BUT my truckl starts when its 15 below, choke works (belive it or not) and I dotn have any hesitations at all.. drives great!!!! so im stuck on 16, and i guess thats where itll have to stay... But here in MN too the put ethanol blends in their gas and change the O2 content in the winter and that hurts milage as well.... hope this helps, and i love my straight six too....
--mike

*racedvl* · 02-10-2003, 09:40 AM

One word. 700R4.

arveetek · 02-10-2003, 02:20 PM

Two words: 700R4, diesel.

A 6.2L diesel mated to an overdrive transmission in your truck would yield you about 22 mpg, on average....assuming you already have 3.08 gears or so.

**swervin ervin** · 02-10-2003, 07:24 PM

Gas mileage?? What's that??

TODDS 72 · 02-10-2003, 07:38 PM

Put it this way .....if your out of beer you bye more.If your trucks out of gas you bye more...repeat as needed....and like mike said
WHATS GAS MILEAGE............lol

Big Paul · 02-10-2003, 08:35 PM

I kinda agree with buying the S-10 thing, my 2.8L gets 30MPG on the freeway. But if I had a I6 C-10 I wouldn't give it up.

Wojo · 02-12-2003, 01:00 AM

thank you everybody.....lots to think about

Wojo

gchemist · 02-12-2003, 03:44 AM

Wojo,
Before you go out and spend some money on the bed cover try this. Remove the tailgate for a gas tank or two. See if you notice the difference in gas milage. If you do then buy the cover. I bought mine because I know it helps after having had a full fiber glass cover on it before. My truck was an '83 with and I-6. For every long trips I always put the tailgate down. The drag on longbeds is more noticable than short beds.

02-10-2003, 01:11 AM	#1
Wojo Registered User Join Date: Jan 2003 Location: Kent, WA Posts: 16	need ideas for good gas milage Guys, I'm driving this rusty 75C10 with in line six and factory Rochester carburator and 3 speed automatic tranny..........getting 16 mpg street/hwy What's the best idea for good gas milage setup ? Don't care about the power, just want to have this truck for everyday driving. I will be happy with 20mpg or better. Would aftermarket carburator make a difference ?? How about getting new motor and tranny and carburator .......... Wojo

02-10-2003, 01:23 AM	#2
Trick76 Living la vida broka Join Date: Jan 2003 Location: P'ville California Posts: 221	Step 1: Walk to local Chevrolet dealer Step 2: Buy new S10 Step 3: Enjoy 25-30 MPG! lol j/k 16 MPG isn't all that bad I would be happy with that __________________ 1976 C10 Longbed lowered 5/7, hot 355/TH350. ~ SOLD 1974 C10 Shortbed Stepside 350/Saginaw ~ SOLD 1984 C10 Longbed 6.2l diesel 700r4. ~SOLD 1985 GMC C20 350 700r4, ~under the knife

02-10-2003, 02:42 AM	#4
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Get one of these. The I-6 would really like the addition. The tailgate is really a gas milage killa. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-10-2003, 03:11 AM	#5
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	If you don't have a high gear ration (3.07 or lower numerically) this would be a good time to get them replaced. These are good highway gears but not best for off the line and towing which I bet you won't be doing much with the I-6. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

02-10-2003, 03:11 AM	#6
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	hey, just wanted to pass along that that kinda milage aint that bad for the inline... I have a 74 c10 250-6 and htree on tree 3.73 gears and 30.5 tires and get around 13city/16highway, and ive tried every trick in the book to bring it up... I had a 80 k5 blazer with same gearing 31's and 3sp/creeper and got 19-20 hwy... BUT until yesterday reading through doug roe's rochester carb book, the carbs were different and that could be the prollem... our rochester monojets were great simple carbs buthte dual jets gm put on em in later years were actually better on gas... NOW ive gone through the trouble of blueprinting my carb, a valve job, all new hoses, sandblasted and painted intake/exhaust manifolds, HEI (with all new delco plugs, cap rotor etc), 24 in/Hg vacuum, new exhaust with 2.25" dia pipe, all in the search for htose few precious more miles per gallon... but i cant seem to squeeze any more out of it... BUT my truckl starts when its 15 below, choke works (belive it or not) and I dotn have any hesitations at all.. drives great!!!! so im stuck on 16, and i guess thats where itll have to stay... But here in MN too the put ethanol blends in their gas and change the O2 content in the winter and that hurts milage as well.... hope this helps, and i love my straight six too.... --mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

02-10-2003, 01:33 AM	#3
Wojo Registered User Join Date: Jan 2003 Location: Kent, WA Posts: 16	............. don't have any problems with step 1 and 3......step 2 is unfortunatelly out of the questions. ....the thing is that I just absolutely LOVE my C10...we were bonded for live........ plus she is 100% paid for

02-10-2003, 09:40 AM	#7
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	One word. 700R4.

02-10-2003, 02:20 PM	#8
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	Two words: 700R4, diesel. A 6.2L diesel mated to an overdrive transmission in your truck would yield you about 22 mpg, on average....assuming you already have 3.08 gears or so. __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's

02-10-2003, 07:24 PM	#9
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Gas mileage?? What's that?? __________________ Mike 1985 Chevy C-10

02-10-2003, 07:38 PM	#10
TODDS 72 Not the nightly winner Join Date: Jul 2002 Location: CHARLEMONT MA.USA Posts: 763	Put it this way .....if your out of beer you bye more.If your trucks out of gas you bye more...repeat as needed....and like mike said WHATS GAS MILEAGE............lol __________________ 72C10SWB BLUE 350/350 86K10LWB BLUE 5.7 700r4 7.5' fisher plow 93S10XCAB4X4 BLUE 4.3 4L60e 69gmc c10 v8 3 on the tree yellow 72k10 swb 350 3 on the tree green 86k15 swb5.0L 4spd brown

02-10-2003, 08:35 PM	#11
Big Paul Iamnotanofficerofthelaw Join Date: Feb 2002 Location: Turlock, California Posts: 352	I kinda agree with buying the S-10 thing, my 2.8L gets 30MPG on the freeway. But if I had a I6 C-10 I wouldn't give it up. __________________ ~Paul~ '96 C1500 Silverado- Vortec 5.0L/Exhaust/Stock '87 S-10 Ext Cab- 2.8L/700r4 KIA Caught fire 12/7/03

02-12-2003, 01:00 AM	#12
Wojo Registered User Join Date: Jan 2003 Location: Kent, WA Posts: 16	thank you everybody.....lots to think about Wojo

02-12-2003, 03:44 AM	#13
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Wojo, Before you go out and spend some money on the bed cover try this. Remove the tailgate for a gas tank or two. See if you notice the difference in gas milage. If you do then buy the cover. I bought mine because I know it helps after having had a full fiber glass cover on it before. My truck was an '83 with and I-6. For every long trips I always put the tailgate down. The drag on longbeds is more noticable than short beds. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos



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