Does the 2004 engine perform slightly better than the 2003?

[Grendel]

I am getting pretty decent gas milage of 12.4 with my 2003. That is combination of city and highway. The only time I have noticed you can average 14 to 16 mpg is when you are traveling on a level road and going about 40 to 50 mph. I do however have the H2 reprogramed with a Predator, JBA shorties, Corsa Sport, and Nology wires.

2003 Pewter H2