Welcome to GS!
It looks like you have a great platform to start with. I'll admit the best car I had was a '99 Civic (Si/SiR).
I recommend looking at the
"Busted and Confirmed Mods" thread to get some ideas for experimenting. Also, anything from simple to advanced driving style techniques can improve MPG.
Let us know if you have any questions -- we're here to help
RH77