newbee with a saturn and 45 mile commute

[sweet60]

Hi everybody I just ran across this website. And I sure am glad I did. I currently drive a 99 sl1 that I bought last year with a bad motor. Replaced that and have been pretty happy so far with my best mpg being 38.7 after a fresh oil change in the summer months. In the winter its drops all they way down to 29 (minnesota fuel). Any tips for me on how to up the mpg maybe just a titch more. Not sure hoiw much I'll do to this car Since I'm looking to replace this one with another sl1. I ran across a guy who did a total underbody pan and that was neat. So now I'm kinda thinking what mods can I do to atleast break 40. Lemmie know I appreciate it