[Sovran]

I currently commute 45 miles each way on freeways or well-maintained state highways, and there are lots of long downhill sections. '13 BRZ auto, everything stock. I'm averaging 36.4mpg in those conditions over the last 6 months.

Just for contrast, I absolutely do drive it like a Prius while commuting. (In fact, I sometimes get better mileage than my wife's Prius in her much-less-helpful driving conditions). One of the reasons I bought a BRZ is that it's fun to drive even with MPG in mind. I save the "spirited driving" for the track and canyon driving. FWIW, acceleration rates for me are dictated by traffic flow, not by my preference to be fast or slow.

Over 70k miles in 5+ years and a variety of commuting conditions, I've averaged 30.3mpg.