Ok thanks!
I just filled my 300TE up and 100% city driving net me
12.5mpg 
Thats horrible isn't it? The car wasn't idling and I was driving gently. I suspect if I were driving a little harder I would have been at like 11!!!
Do you have any thoughts that my Thermostat could be at fault? I have no engine temperature problems but I heard somewhere this effects MPG if its bad.
Any thoughts?