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#1 |
Registered User
![]() Join Date: Jan 2005
Location: Illinois
Posts: 1,006
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Gas MPG Questions
I have a bone stock 350, 2.02 heads and nothing else. I am running a 600 cfm Edelbrock carb, 700R4 trans---as you can see nothing fancy...what kind of gas milage do you think I will see with this combination--on the highway 65 mph??
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#2 |
Registered User
Join Date: Jan 2008
Location: Orwigsburg PA
Posts: 59
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Re: Gas MPG Questions
Between 8 and 20 MPH
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#3 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Gas MPG Questions
depending on what rear you have// if 373 or so i'd say about 16mpg if your engine is tuned up properly
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#4 |
knuckle buster..
![]() Join Date: Oct 2007
Location: Frisco
Posts: 613
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Re: Gas MPG Questions
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_______________________________________________________________________________ Eric THIS SITE ROCKS!!! ![]() Check out my suburban on 20's with fresh paint! Click here to support the site Check out the Member Photo Gallery here StreetCruizin FAQ thread Site vendors list (scroll down to vendors in red) ![]() ![]() |
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#5 |
Senior Member
![]() Join Date: Apr 2003
Location: Howard, Kansas USA
Posts: 1,997
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Re: Gas MPG Questions
yeah, these trucks don't get too bad, my healthy 350 with a 308 rearend 4X4 and a 4 speed gets between 13 and 15, and the last time i checked, that is not much better than the new gm's
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#6 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Gas MPG Questions
You need to look at your tire size, rear end ratio, and RPMs for the speed you choose. Once you know these, then you can figure closer what your mileage should be. If your tires are TOO tall, then you will work your truck to death getting up to speed and overcoming hills. If your tires are too small, then the RPMs will be high. Changing tire size is the equivalent of vchanging rear end gears. If you are geared too low, then you will run high RPMs and the mileage will be bad. If you are geared to high, the engine will work harder in a city type of driving, but will be smoother on the highway.
Is your exhaust and air cleaner restrictive on flow? That will change gas mileage a lot. Getting rid of the stock belt driven fan is worth a single MPG gain. |
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#7 | |
Registered User
Join Date: Jan 2008
Location: Orwigsburg PA
Posts: 59
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Re: Gas MPG Questions
Quote:
The Jets in the Carb and your Cam shaft can greatly effect milage.
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It is better to live one day as a Lion then 100 years as a Sheep Dingers Build Thread Dingers Before Pic's My 67 Camaro |
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#8 |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
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Re: Gas MPG Questions
I'm set up very much the same as you. I keep pretty close tabs on my mileage. The best I've ever done was Tucson to Phoenix (at about 65 all the way), no a/c. Got 13.8. I usually get 11.6, around 10 with a/c. that's combination city & highway. That's with an Edelbrock 1406 carb. I think the consensus around here is that the Qjet is more efficient. Myself I'm thinking of going to a tbi setup at some point.
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#9 |
Registered User
Join Date: Nov 2004
Location: Nebraska
Posts: 762
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Re: Gas MPG Questions
Wow, I have a bone stock 70 Blazer with 82,xxx miles and 31" tires and 3.08 gears. I'm always amazed by the gas milage others are geting. I dont think I ever hit over 10, I seemed to always be in the 7-8 range. Hopefully the tires are throwing the odometer off and it is not counting correctly, because everytime I check it is painfully low.
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#10 |
Registered User
![]() Join Date: Jan 2005
Location: Illinois
Posts: 1,006
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Re: Gas MPG Questions
I have a 3.73 rear end...
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#11 |
knuckle buster..
![]() Join Date: Oct 2007
Location: Frisco
Posts: 613
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Re: Gas MPG Questions
is it a posi?
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_______________________________________________________________________________ Eric THIS SITE ROCKS!!! ![]() Check out my suburban on 20's with fresh paint! Click here to support the site Check out the Member Photo Gallery here StreetCruizin FAQ thread Site vendors list (scroll down to vendors in red) ![]() ![]() |
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#12 |
Registered User
Join Date: May 2002
Location: Gainesville, Georgia
Posts: 704
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Re: Gas MPG Questions
I've seen a few of these threads and I'm always surprised at how small the milage numbers are for the overdrive swaps. I have a 72 1/2 ton suburban with 350, dart s/r heads, mild cam, edelbrock intake and carb, 350th, 3.08 gears. 15 mpg highway.
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#13 |
Registered User
![]() Join Date: Jan 2005
Location: Illinois
Posts: 1,006
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Re: Gas MPG Questions
You an me both...there must be some heavy feet in here
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