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Re: Gas mileage
I'd say leave the engine alone as long as it's running good. Your mpg is decent for what you're doing with it. A 4 barrel is going to suck down a lot more gas.
You should try to find out what ratio you have now, and look into swapping for a lower one. 4.11 is great for hauling/towing, as long as the transmission's top gear allows for highway speeds.
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