Very, very well put, Cody. 
With your permission, can I re-post this (giving you credit) on another forum?
Quote:
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Is it impossible to get better mileage with aftermarket tuning? No. It it reasonable to expect an increase? No. You just have to realize that if you want better fuel economy, even with aftermarket tuning, that you're STILL going to have to drive like you actually want good fuel economy. There are things that all aftermarket tuning companies do to help increase the efficiency of the engine. The automakers are responsible for selling a product that makes a specific amount of horsepower and remaining suited to taking on all kinds of driving/usage demands. They also are REQUIRED by a rip-off governmental agency called the EPA to meet certain guidelines for specific emissions. These emissions guidelines have a profound effect on what automakers can get away with in thier stock tuning. Basically, we in the aftermarket trade hydrocarbons for oxides of nitrogen. We can increase the combustion temperature and pressure to help with efficiency. This increases the amount of "Nox" emissions, but helps a little with hydrocarbons (which boils down to efficient fuel usage).
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^My favorite part, BTW. 
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02 F-350 Super Duty SCSB 4x4 SRW 7.3L TD, DIY-I, PHP-6 Phoenix, 4" Turbo-Back 409 MBRP, Glowshift 3 in 1, Fisher 8' MM2
"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
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