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I had an old 1 ton 72 GM pick up with a 350. Normally I can get about 11-12 mpg, completely stock. I went and install a 4 barrel carb and intake. it woke up the truck, but suffer in milage. 7-8 mpg. If I were to do it all over again, I look into a forth speed tranny like Angela said just to squeeze a few more miles out of a gallon.
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