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Old 01-09-2013, 08:34 AM   #28
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Join Date: Sep 2012
Location: Old Greg's Cavern
Posts: 12,555
My Ride: '13 128i, '04 330Ci
I noticed maybe a slight increase in MPG when I replaced my thermostat but not much. I replaced my thermostat and then spark plugs 300 miles later and I get just over 30 mpg at 70 mph in an empty car.
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