I'm averaging 20.5 - 21.5 mpg when I hand calculate the mileage. All my driving is "spirited" mixed driving..... i.e. I drive it like a go-kart.
I'm normally on backroads that are "50 mph" (pfffft) and a stretch of 13 miles at 70 mph (which I normally have the cruise set).
I have yet to do a tank where I've just been able to cruise.....I just have too much fun in the car.