I now have 5100 miles, and my overall average is 51. I don't hyper mile...just keep with the flow of traffic on both freeways and back roads . Fantastic mileage overall.
I just went in for my first 5000 mi toyota care maintenance, my average is 57.5 mpg, mostly highways, no special techniques (except not being a jerk on the road). I commute 40 mi to and from work everyday and average around 55 mpg in the morning and 60-62 mpg coming home at night. Love this car.