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  #1  
Old 09-13-2008, 07:52 PM
Zack
 
Join Date: Nov 2007
Location: Knoxville, TN
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Thermostat and Mileage

Can having a proper functioning thermostat affect mileage?
Mine was messing up so I just took it off and I haven't gotten around to putting the new one on yet.

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  #2  
Old 09-13-2008, 08:06 PM
ForcedInduction
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There MUST be a thermostat in the system for it to flow water correctly. Its a mixing valve and without one the water will just circulate around the block and not get cooled.
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  #3  
Old 09-13-2008, 08:14 PM
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proper operating temperature (or even a wee bit hotter) and good MPG are related.
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  #4  
Old 09-13-2008, 08:32 PM
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I thought that it was just me but --- my 300SD gets better mileage when it runs hotter. My radiator is dirty and I need to clean it but the mileage is up and I don't want to mess that up. 27mpg at highway speeds (70 +) compared to 24.-- normal

85 300SD 248k

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