I drive hard and I am at 16.9 lifetime at just 5000 miles. There are a lot of things that dictate MPG though so it is hard to say what you will get. I got 18.1 lifetime on my 14 V6 with mostly the same driving habits (though I can not drive the GT as hard all the time).How much do you have to get on it to really drop it down to the mid teens for MPG? In a 30 minute commute, I like getting on my car for a decent pull 3-4 times. Just trying to get an idea what to expect.