Hi Donovan,
Welcome to the site! My motor is almost all original with 217k miles so far. I've replaced the oil pump, water pump, crank bearings, rod bearings, valvestem seals and springs. The head has never been off, still using original pistons+rings. I've done some mild bolt on mods which are listed in my profile.
Most of the stuff you can do to save gas is common to other cars, so take some time to browse the site and read the stickies. When I first found out about the Gas Savers website I was very happy to be getting around 34mpg. Now that I've been reading and learning about fuel economy my mileage has steadily increased for the past year. I'm sure it'll get even better in the future.
The first mods are easy. Start by pumping up your tires to at least 40psi. Read the label on the sidewall of your tires to see what the max pressure is. If you can handle the harder ride quality, try raising tire pressure to the max.
Make sure your motor is running well. Fresh sparkplugs, plug wires, and O2 sensor are always a good idea, especially if you don't know the last time they were changed. Our cars are getting older and vacuum/ boost leaks pop up unexpectedly, so do a boost leak test. If there are any leaks it will throw off the airflow sensor readings and the ecu will be out of it's sweet spot. This is something I spent a lot of time working on.
Change the oils in the transmission, transfer case, and rear diff to lightweight synthetic oil. The lighter weigh oil will have less drag, and the synthetic formula will still provide good protection. I recomend Redline Lightweight Shockproof in the rear diff and transfer case. My tranny prefers Penzoil Syncromesh or Redline MTL.
If you have the money and drive on the freeway often, consider getting a TRE 10% taller 5th gear. They cost $235,
http://teamrip.com/GENUINE_FACTORY_AWD_PARTS.html
I got one for my fwd Laser about 6 years ago, so it's more than paid for itself in saving gas.
Here's a tech article I wrote showing how to save gas. There's more good info there, too. Enjoy!
www.DSMTuners.com/forums/showthread.php?t=254223