Just filled up. 18.7 MPG on the last tank of Chevron 92 octane. 20% freeway, 20% city, 60% fun roads. The freeway and city driving is mostly to get to the fun roads. AT almost always in manual mode, "pedal dance" on fun roads, if that matters. Imagine how low I could get my MPG with a manual trans.
ETA: Your mileage (generally) is totally dependent on your right foot. If you want to be driven insane and be in genuine fear for your life, go for a ride with a Prius owner who's main goal is the greatest MPG he or she can get. Absolutely unwilling to drive with any sort of urgency when needed. You start to wonder if it will be the oncoming truck or some dude with a gun who will do you in.
Boring, but I've always assumed people knew how this works. Most of them are "No shit, Sherlock?"
Top 20 Driving Tips to Improve MPG
Oddly enough, I use some of the techniques listed above, the main one being having a fucking clue and planning ahead. I realize there are perfectly valid reasons (the new me, do you like it?) to be seeking the best MPG, but this is really the wrong car for that.