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Old 03-25-2013, 03:33 PM   #18 (permalink)
ConnClark
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Join Date: Jun 2008
Location: Richland,WA
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Das Schlepper Frog - '85 Mercedes Benz 300SD
90 day: 23.23 mpg (US)

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I thought I would chime in on this. The biggest gain from running a higher temp thermostat is that the combustion gasses loose less energy to the cylinder walls and head, thus providing energy for the piston to extract to make the wheels go around. Having the cooling fan come on less is miniscule by comparison.
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