Eh? What kind of Honda could I have gotten in 2004 as a 1 year old used car for $16K that would have gotten > 50 mpg? (The Honda Fit wasn't introduced in the US until 2006.) For that matter, what kind of non-hybrid car of any make or model could I have gotten in 2004 for that amount of money that would have gotten > 50 mpg?
Most of my drive to work is highway (at 70-75 mph). The Honda Insight (first generation) has better mileage on the highway than on surface streets (official EPA estimate was 48/59 - I've averaged 51.8 mpg over the life of the car so far). The hybrid system works differently than the one in the Prius, which does better on surface streets.
