I'll be checking my thermostat temps this weekend while the wife is gone. EGR Cooler was already replaced under warranty about 13k miles ago (@41k). Wife drives a lot around town for work and I noticed yesterday her avg mpg was only around 20mpg. I'll reset it this weekend, take a nice drive on the hwy and around town and see what my average is. Compare figures and see if it's just her lead foot or if the t-stat temps aren't getting up to normal operating temperature.

Funny I noticed my mpg in the E39 M5 drop to around 15, and thermostat is replacement is in order (81k miles on original).

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2004 BMW M3 Individual
2009 BMW E70 X5 35d
2011 BMW E70 X5 35d - Totaled
2009 BMW M3 E90 - SOLD
2006 E53 X5 4.8iS - SOLD
2002 E46 M3 Convertible - SOLD
2006 E46 M3 ZCP - SOLD
2011 E70 X5 35d - SOLD
2000 E39 ///M5 - SOLD
2003 E53 X5 4.6iS - SOLD
2006 E83 X3 3.0i MSport - SOLD
2000 E46 323Ci - SOLD