I disagree, the reason todays engines are run at the higher temperature is to meet emission requirements. The modern engine is set to run as high as 215 degrees and in a fuel rich condition, both needed to make the catalytic converters work better.
Unless I have been misinformed, the high performance chips and reprogrammed ECUs lean the mixture to gain power.
I ran extensive baseline tests using a G-Tech meter before I began modifications to my 02 PT, and after each change along the way. After adding a Volant cold air package my HP was up by 10.5 and mileage INCREASED by 3mpg in mixed city/highway and by 5mpg at my cruise speed.
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