It's time for new tires at 45k miles. I have a standard range Lariat so I'm looking for tires that will improve range or at the very least not decrease it. Also considering getting new wheels as well.
I have almost 800 miles on my Bridgestone Dueler Ascent, ZERO complaints. I love the more aggressive look without it being over the top and thus far my commute is tracking no range loss. Just as quiet and comfortable as the stock Grabbers. If the durability proves comparable ( ~40k ) I'll definitely stick with them.
The only way I know of to improve range is to go smaller. Just don't go too small, it's a big truck so you need rubber on the road to make it stop.