The cooling capacity increased by one gallon, the size of the washer fluid reservoir. (As I use the washers, and deplete the fluid supply, my cooling capacity should diminish a bit -- at least until I refill the tank.)
My thermostat is Ok -- was replaced a few years ago after it went bad. At that time, the coolant temperature was about 60 on the highway (in late fall).
Today, the outside temperature dropped from the 90's to about 70, and the car running at 79 degrees at 50-60 mph (~2300-2800 rpm.) Time to increase my antifreeze ratgio a bit, just to keep the engine warm enough. In summer. 
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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