People just need to learn to drive efficiently, if they want to consume less.
You can't expect to just buy a Prius, drive like a mad man and burn like the EPA numbers.
But, if you drive with a grain of salt, you CAN even exceed EPA numbers. A lot of hybrid drivers do that.
In addition EPA numbers are just the results for a standardized set of tests, with some additional corrective factors. Depending on where you live, how's your commute, etc., you situation may approach more or less that scenario.