Welcome, Greg. Jay and I both have GM full size V8 pickups that we try to drive efficiently, and there's quite a few other members with medium and full size pickups/SUVs. The driving techniques are mostly the same.
The first and most important thing to do is to track your fuel economy accurately. Enter your vehicle into the GasSavers.org Garage and start a gaslog. Every time you get gas, record the miles you went on the last tank and how much you put in. Don't top off, stop at the first click; and if it's not inconvenient, get gas on the same side of the same pump each time (to get accurate first-click shutoff).
These vehicles often have tires that can accept higher pressure than most, and some people (me!) can use very high pressure without any compromise in ride, handling, or wear. The increased tire pressure, if it doesn't compromise any of those things, can help fuel economy, is totally free, very easy to do, and doesn't require you to adjust your driving.
Automatic transmissions often don't operate the most efficiently if you accelerate too softly. Once you have a good baseline in your gaslog, experiment with different acceleration styles, each for a few tanks, to see how they affect your fuel economy.
Of course, if you want to, you can always gain fuel economy by slowing your cruising speed...but you surely knew that already.
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