I only have 2,600 miles on my SRT6. I still haven't had a tank where I wasn't mashing on the gas every time I needed a little boost to get through traffic.

There's nothing wrong with a little spirited driving every once in a while, right?
My best tank was around 21 MPG. My worst, around 15 MPG. I can't get 93 octane here, which brings my numbers down a little.