I drive an 01 HX and I love it. Its a Civic so its not fast, but it's given me the best milage of any car I've driven since I bought it new.
I average around 40-41mpg, but the last tank got me 46! 102k miles and still running like a champ. If you can find one, I suggest getting one. Honda stopped production with the new generation, (06-present) but the 01-05's are the thriftiest 100% gasoline car available. It just sucks when the heated o2 sensor dies and it costs $250 to replace it.