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Old 01-08-2013, 07:00 PM   #23
Registered User
Join Date: Jan 2011
Location: San Diego
Posts: 2,928
My Ride: '11 135i 6MT
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.

Past: 1999 Techno Violet Metallic M3
Present: 2011 135i 6MT
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