Hey man i've worked on a few of my buddy's trucks two mods i found always help them are A K&N air filter I got to autoanything,com to buy em because of the free shipping and i also always use a flowmaster 40 with a turndown at the rear axle, these two should be good for 3-5 MPG probably more like 3 for your truck cause those 460's are biiiig gas hogs i feel your pain man
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