[Tim Maddux]

... what downhill-windless city that doesn't have traffic lights was the EPA driving in when they got 57 mpg?!?!?

Tests are done by the manufacturer and submitted to EPA (which checks up on a fraction of them). It's done using a test cycle -- a specification of variable speeds over time including stops. Results are then reduced by 10% (city) and 22% (highway) to better fit real-world driving. More info:

http://www.fueleconomy.gov/feg/info.shtml#estimates

YMMV!