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I have a 1983 1/2 ton 2wd with a stock 350 (edelbrock qjet and manifold) with the granny gear 4-speed tranny. Im heavy on the gas and get around 11-14 mpg city. I do a little better on highway, but at slower speeds then normal because of the 1:1 final gear. I go about 60-75 and 75 is pushing it, rpms get to around 3500-4000, I dont like that.
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