The best ive gotten out of one tank of gas was 365, and mostly on highway..

 

I just got 16 MPG with all city driving in STL, lots of stop and go. I was also burning gas going faster than I needed to inbetween stop signs. My normal in city is about 20MPG. The weather did drop so that also added to the gas burning.

On all highway I get 33 MPG on cruise control.