Gasoline has 114,100 BTU of energy while alchol has 76,000. That is all the energy there is so if the engine is designed close to max output of the fuel, there is only so much power it can produce period. Octane will slow the burn giving a longer push but a will designed engine has optimized this fact.

You are correct, 20 HP is somone selling somthing. If the engine is poorly designed, somthing like this pushing the ECM to control with the knock sensor will kick some HP. The ZH engine is pertty well designed, this device would not increase power as much as it would increase fuel milage. Remember the max output ratio of fuel is 14.1 to 1. If you want more power you need a bigger hole. Tuning to near knock is as good as it gets without doing somthing with the combustion chamber dynamics. Keep in mind, knock is nothing more than pressure bouncing around in a combustion chamber. That is what the HEMI engine design is all about... No Knock Capacity just straight line push on a piston.

Keep in mind, if the knock sensor should fail, you are in deep crap, the engine will eat itself so have a defete device in your glove box.

Hope this helps you understand what fooling the IAT sensor will do for you.