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It's interesting that someone else has noticed this. Yes I believe you are correct. I believe the engine computer is compensating for the significant amount of heat that can be removed via the heater core, and the highly efficient low heat capability of the engine.

Are we both talking about the 1.4L? While I haven't charted the results, I also believe that higher heat usage directly corresponds to about 2 mpg loss in fuel economy. Makes sense if the engine is tryino to hold a higher temperature for emissions reasons.
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