Looking for ideas on improving gas mileage - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jeremy69 · 07-29-2012, 08:17 PM

Hey guys sorta new here, but I've had a love for these trucks since I could drive. I'm looking for any ideas on how I can improve my mpg. I have a 69 Lwb with a 350, th 350 tranny. I have acquired a two bbl stock carb to replace the thirsty edlebrock I have now. Planning on using a choker plate for now because I don't have a 2 bbl manifold. Someone said I can change the rear end to a higher ratio as well. This will be my DD until I get my regular up and running. Any other ideas will help a lot thanks!
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CC69Rat · 07-29-2012, 08:59 PM

700R4 trans, 3:23 or so rear gear.

70 shorty · 07-29-2012, 09:03 PM

Believe it or not, a stock quadrajet will actually do better than a 2 barrel. I think the biggest improvement will come from the driver. Simple things like coasting to a red light waaaaaay ahead, rather than keeping your speed to be the first one in line, and taking off with a light throttle.

Jeremy69 · 07-29-2012, 09:03 PM

Nice I'm looking for a 700 r4 too sounds like a good ratio too
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Jeremy69 · 07-29-2012, 09:05 PM

I wasn't able to find a q jet right now so I'm stuck with the deuce but I'll look for one. Thanks!
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ole dollor · 07-29-2012, 09:30 PM

are you still using points and cond....if so, hei will help , rear end change could help if yours is like a 373 or 410. , 700r trans would help the most i would think, even with the rear end you have now...you did not say what your gears are now...

brianthelion02 · 07-29-2012, 09:45 PM

What kind of mileage you getting now? My 71 just did 13 to 17 mpgs on the road depending on my speed.Mine has the stock quad and 3.08 gears.

Hubscrub · 07-29-2012, 10:00 PM

Quote:

Originally Posted by 70 shorty

Believe it or not, a stock quadrajet will actually do better than a 2 barrel. I think the biggest improvement will come from the driver. Simple things like coasting to a red light waaaaaay ahead, rather than keeping your speed to be the first one in line, and taking off with a light throttle.

thats what i was going to say, get a Q-jet go to swap meet there is usually several around, they have the small primaries and huge secondaries unlike the others with all four the same which should give better mileage.

07-29-2012, 08:17 PM	#1
Jeremy69 Registered User Join Date: Jul 2012 Location: Star City, AR Posts: 72	Looking for ideas on improving gas mileage Hey guys sorta new here, but I've had a love for these trucks since I could drive. I'm looking for any ideas on how I can improve my mpg. I have a 69 Lwb with a 350, th 350 tranny. I have acquired a two bbl stock carb to replace the thirsty edlebrock I have now. Planning on using a choker plate for now because I don't have a 2 bbl manifold. Someone said I can change the rear end to a higher ratio as well. This will be my DD until I get my regular up and running. Any other ideas will help a lot thanks! Posted via Mobile Device

07-29-2012, 08:59 PM	#2
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,212	Re: Looking for ideas on improving gas mileage 700R4 trans, 3:23 or so rear gear. __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

07-29-2012, 09:03 PM	#3
70 shorty Where's my beer? Join Date: Oct 2004 Location: Glen Allen, VA Posts: 1,772	Re: Looking for ideas on improving gas mileage Believe it or not, a stock quadrajet will actually do better than a 2 barrel. I think the biggest improvement will come from the driver. Simple things like coasting to a red light waaaaaay ahead, rather than keeping your speed to be the first one in line, and taking off with a light throttle. __________________ 70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K

07-29-2012, 09:03 PM	#4
Jeremy69 Registered User Join Date: Jul 2012 Location: Star City, AR Posts: 72	Re: Looking for ideas on improving gas mileage Nice I'm looking for a 700 r4 too sounds like a good ratio too Posted via Mobile Device

07-29-2012, 09:05 PM	#5
Jeremy69 Registered User Join Date: Jul 2012 Location: Star City, AR Posts: 72	Re: Looking for ideas on improving gas mileage I wasn't able to find a q jet right now so I'm stuck with the deuce but I'll look for one. Thanks! Posted via Mobile Device

07-29-2012, 09:30 PM	#6
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: Looking for ideas on improving gas mileage are you still using points and cond....if so, hei will help , rear end change could help if yours is like a 373 or 410. , 700r trans would help the most i would think, even with the rear end you have now...you did not say what your gears are now...

07-29-2012, 09:45 PM	#7
brianthelion02 Overdrive club Join Date: Sep 2007 Location: apache junction, arizona Posts: 819	Re: Looking for ideas on improving gas mileage What kind of mileage you getting now? My 71 just did 13 to 17 mpgs on the road depending on my speed.Mine has the stock quad and 3.08 gears. __________________ 1971 c-10 1951 3100 chevy 1970 chevy c-30 Sold! Last edited by brianthelion02; 07-29-2012 at 10:09 PM.

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