youd prolly get somewhere in the 10ish range compared to what others are getting. our f.e.'s are such economical little motors. 
mileage expectations
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Lead Driver
Joined: Jan 2006
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From: Colonsay Sk. Canada
mileage expectations
Just got my 67 going again. It's got a 352 4 spd. 4.10 rear end 16inch. tires and it's a 3/4 ton. Anyone with a similiar truck knows what they get for mileage?
Laughing Gas
Joined: Jan 2002
Posts: 1,008
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From: Tucson
My stock 352, 1/2 ton, 3.50 rear end, 2 bbl and headers got 11.6 mpg in town and flirted with 14 mpg on the highway. The same truck with its current engine gets about 6 mpg. I'm thinking you will be at < 10 mpg. Good thing gas is so cheap!
jor
jor
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Joined: Jul 2004
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From: Westminster, Colorado
And I thought a bigger engine would be less efficient...My 390 gets around 15 to 16 MPG....I did add a new Carb.....the old one got 7.5! 
Still very expensive to feed. I don't know if the fact i live at 5400 feet helps or hurts......The sell both Propane and E-85 here in Denver/Boulder.....not to mention "bio-diesel," but I'm not quite ready for my truck to smell like a french fry stand! lol
Has anyone done a propane of E-85 upgrade? Any comments?
Still very expensive to feed. I don't know if the fact i live at 5400 feet helps or hurts......The sell both Propane and E-85 here in Denver/Boulder.....not to mention "bio-diesel," but I'm not quite ready for my truck to smell like a french fry stand! lolHas anyone done a propane of E-85 upgrade? Any comments?
Last edited by Unimog005; May 4, 2006 at 05:31 PM.
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Post Fiend
Joined: Dec 2003
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From: "Islander"
On a 68 CS 414 w/C-6 and 3.54's up Central California the last trip I squeaked out 14.15 mpg. This is all flat and at sea level, I refilled at the same station and pump after the 563mile round trip. I can burn of 56 gallons with the 3 tanks on board. I'm happy as this is a 255K mile motor. Tune then retune until you tried everything for better mileage less the heavy foot.
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