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As t_g_farrell said make sure everything is up to snuff tune wise first. It sounds like you're probably running overly rich. The numbers you're quoting are a little low for a stock port 12A. If it's ported those numbers are quite possible though. Getting more fuel mileage out of them is mostly a matter of keeping the rpms down at cruise and minimizing parasitic losses (when everything else is running right). Dragging brakes, wide tires, overly thick engine, trans, and diff oils, etc. will all cost you in terms of mileage.
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