[Diesel_Dave]

First off, welcome to the site!

It's not that sexy, but in my opinion, the first step that you need to do is start keeping a good fuel log (if you're not already--I see you have one fill already on your fuel long on this site).

Another thing that I would consider a "must" is getting some kind on real-time fuel economy feedback. I'm guessing the stock truck doesn't have anything. Most folks around here will attest to the fact that driving mods will typically buy you more fuel economy that vehicle mods will. Of course with an auto tranny, you'll be more limited, but I think you'll be shocked how much you can improve things with driving mods.

After you get some good record-keeping, just start making one mod at a time and you'll start seeing progress.

Good luck!