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With the winter weather, you're actually likely to take a hit in fuel economy - do some searches for a WAI, or warm air intake.
The flowmaster will likely only help at high RPMs, where you aren't getting great FE anyway, and most of the superchip results I've seen result in lower Air/Fuel ratios. Is yours one of the power programmer superchips? If so, I'd recommend setting it for the best "torque" setting, as with most engines you'll get the most power at the low end of the rpm range.
Your mods will net your truck higher performance- faster acceleration and more power, but more fuel used. The exhaust won't hurt or help much for fuel economy.
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