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This is interestingly a two-edged sword. If you look closely at a lot of the dyno charts for these tuners they show their highest gains below peak. What you are really getting is a broader power curve with more gains down low. (This is generally what I have seen.) That's accomplished by taking out some of the fuel under those parts of the curve. Through the 90's and probably into the 00's manufacturers seemed to be adding a little fuel to the curve to ensure reliability of the motor. This explains how a tuner can give both power and economy simultaneously. To that end, be careful when you go changing your maps for efficiency. Most motors can't take big changes.
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