he wants more HP AND more torque AND more MPG ... sorry buddy, its not happening.
if you want some HP and torque .. youve gotta burn some gas to get it.
If you want your MPG .. youve got to part with some HP and Torque. You just cant have both.
I'll second MO with the flasher over the chip. but theres a trade here too...
You need to know how your engine does the voodoo it do. Blind stabs at a fuel map burns valves and whacked timings can trash heads and pistons.
However, for accepting the risks above, which can be minimized through knowledge, you can cook up some killer tunings and switch between them with ease.
one tuning set for every day MPG oriented grocery gettin.
Another tuning for towing.
and yet another for getting in touch with your inner young punk.

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it just needs more voltage