Thread: Fuel economy
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Old 12-30-2012, 07:50 AM   #20
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,386
My Ride: '06 330CiC, '03 M5
The real question is what is the coolant temperature?

These thermostats fail open ALL the time and the engine can run too cold, when this happens, fuel economy is the first thing to take a dive.

95C is about typical, maybe slightly higher.

Hidden OBC will answer this question in a single trip.
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Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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