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I think it has a lot to do with the fact that EPA numbers are estimates and are derived by testers who baby the car. Hence, maximizing their fuel economy.

My experience with my BRZ has been all over the place. When I drive mostly city (heavy stop n go) I've seen averages at 23 to 24 mpg. When I went on a long hwy trip I've seen averages at 37 to 38. Those are all when I'm really trying to maximize fuel economy. Now what I've learned is that our cars drink substantially more gas when you get a little bit heavy footed with the go pedal. When I drive aggressive, I've seen averages as low as 20 to 21 mpg. Of course, there is a big difference between driving with fuel economy in mind and driving aggressively, but I've noticed that if you drive these cars like it was designed to be driven you will nowhere near see EPA estimates. Not even close! The positive side to this is that if you do drive with fuel economy in mind you can, at least, get near the stated EPA estimates.