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Old 09-18-2002, 05:19 AM
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Post Fuel Economy Sucks

The thread about what people are paying for gas around the country made me realize that I am getting ****ty gas mileage. The truck is an 86 Chevy C20 with a 350 2x4. I just recently aquired the truck and see I am burning fuel faster than any other old car I have owned. Any suggestions on what I can do to improve my gas mileage? I am already avoiding speeding. Unfortunatly. <img src="graemlins/crash.gif" border="0" alt="[crash]" />

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Old 09-18-2002, 06:54 AM
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Automatic or 4 speed ? Without going into the engine? Clean air filter, tune up, headers, upgrade exhaust system, proper tire pressure.carb adjustments, jet change fuel bowl level adjustment, driving habits (no jackrabbit starts or power passes.), smooth and laid back attitude. Rearend gear ratio change.
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Old 09-18-2002, 07:19 AM
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To get really into the milage thing, how about a 204/214 RV cam or the old 300 horsepower 327 cam, slightly port the stock heads (if it needs a valve job), 2.70s rear gear, cheap Mallory ignition enhancer, Q-Jet carb with 1/2" phenalic spacer and a heat reflection plate, lock up torque converter. Actually,if you could get a throttle BODY system from a 80s or 90s Chevy truck (I see that stuff on E-Bay all of the time)or just visit your local junk yard, you could noticably increase your milage and have a boost in performance too! Any thing else we forgot? Good luck
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Old 09-18-2002, 06:18 PM
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were these older trucks fuel injected? my dad had a similar problem with his truck. turned out to be the fuel regulator.

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Old 10-05-2002, 08:02 PM
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if you have vacuum advance on your dist make sure that is working. ideally, you want to run as much advance at part throttle as your fuel will let you. there's usually about 20 degrees in an hei can, but you can take some out if it pings by bending the actuating rod on the can so as to limit its movement. i've got mine set at about 10 - 12 degrees vac adv with 12 intial and 15 mechanical. i've got as high as 16 mpg on the highway with a stock 350, qj carb, no emmisions (1973), dual exh and 33" tires acting as an overdrive. <img src="graemlins/crash.gif" border="0" alt="[crash]" />
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