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Re: Post your engine performance mods and HP/MPG gains!!!
is your truck 2dw or 4wd? What size tires? what gear ratio is in the diffs? When is the last time you cleaned or replaced the MAF sensor? when did you last service your plugs and wires? Have you ever ran SeaFoam through the intake to clean it or in the fuel tank to clean the O2 sensors? Are there any check engine lights or codes?
Your economy does seem lo, for a 5.3 you should be able to find 16 mpg in that engine somewhere. I would give it a complete tuneup/service before doing any mods. The 4.8 doesn't get any better fuel economy.
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