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Cool battery makes better FE and longer battery life.
When battery get hot the voltage of the battery goes down and battery gets overcharged. (I might say that overcharging is just boiling water) Cool battery has higher voltage and alternator won't overcharge it.
I haven't been any kind of Volvo fan but past year have been different. Volvo has done many basic and reasonable things for better FE and reliability and this is one more thing to list.
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