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SW
I certainly agree with your observation ..
I think the main reason for the lean burn design is that the auto companies are all looking for max mpg to compete in market share..
..but I can see that the lower ambient temp [as seen by the air temp sensor] would result in better performance, as the engine is running at better power .
I guess that is the theory of fooling the ECU management by using a resistor the value of the Intake sensor at lower temps.
...ie-richer /longer injector durations.