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Old 01-08-2013, 07:00 PM   #23
tock172
Beachtown Bill Collector
 
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Join Date: Jan 2011
Location: San Diego
Posts: 2,885
My Ride: '99 Techno Violet M3
I am now 100% sure my thermostat is failing. Once reaching 'operating temp' according to my gauge, OBC tells me the temp fluctuates between 74-88 on the freeway and 88-91 when idling or driving at low speeds. That explains why my average mileage is 18.5 mpg a tank.
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1999 Techno Violet Metallic BMW M3
2005 Audi B6 S4 quattro 6MT
2004 BMW 330i
1986 BMW 535i

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