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Old 11-18-2012, 11:34 AM   #2366
Commander Keen
Scooby Specialist
 
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
Vehicle:
2012 Impreza 4DR 5MT

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As long as the engine is running at operating temperature, it doesn't make much of a difference whether the excess heat is shed through the block or radiator.

The problem I'm seeing is that the engine sometimes struggles to maintain operating temperature, which definitely has an impact on efficiency.

Most of the engine's power goes towards moving the air you drive through. In the winter, this air becomes more dense and provides more resistance.
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