Help me understand power vs economy as it relates to tuning

[cbattles]

Hypothetically: Let's say that I drive around, I'm light on the throttle, and I never exceed 2200 RPM.

Outside of shift points and torque converter lockup, how can a tune impact my fuel economy?

I'm asking this question, because every "custom" tuner seems to offer a wide variety of "economy" vs tow vs various power level tunes and I just don't really understand what I'm really picking between (behind the scenes).

If higher EGTs come from more fuel with less air, then lower EGTs should mean more efficiency, right? And, towing tunes are focused on EGT management? So is an "economy" tune basically just a towing tune with earlier shifting?

Also, when using very light throttle input, what's the functional difference between a super aggressive performance tune and a towing tune (for example)?

I'm just looking for a deeper understanding of what's actually going on with the myriad of tunes that seem to be available from every tuner, and what I'm actually choosing between (functionally speaking).