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Originally Posted by DanO
That is partially true and you have the right idea. Keeping the engine cooler would allow more air (denser/cooler) to enter the cyclinder and therfore you can add more gas. This results in more fuel energy being put into the engine. However the downside to this is the fact that more of that energy you just put in is going to the coolant. Overall you may come out on top in terms of max power, however, you are using more fuel per horsepower.
Now at part throttle you will NOT need the benefit of filling the cyliders better (your restricting it with your throttle anyway) and you still have the downside of having a greater percentage of your fuel energy going into your coolant. So basically you get decreased fuel mileage.
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Now I have a 160 stat and the fans set to come on earlier. My fuel comsumption hasn't increased. I do have the car tuned though. My thoughts are with any performance part you install you need to setup the PCM for the change you made.
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