Holy dognutz! 100k on a set of truck tires? And you think any other brand is going to do better?
Actually, 110,075 miles currently, with more to go. NO, I don't think another brand is going to get better gas mileage, but I've had enough of that "womp-womp-womp" since 50K miles.
............................I am running the Michelin Defender LTX 275/60-20 on my 2015 Ram. So far so good. 32K miles on 'em now and a little less than half worn.
With regards to your womp,,,womp,,,womp that you have been experiencing the last 60K miles....
To determine if this womp, womp, womp noise you are getting is coming from the tires, I suggest if not done already, that you take the palms of your hands and feel all 4 tires for any high/low spots on the tread. You are looking for any tread seperations such as a bulge of some kind.
The next thing you want to check, is for any tread block scalloping or feathering. If there is and bad enough, then this wear pattern will give you a continuous snow tire type humming noise but not a womp, womp, womp. If there is scalloping or feathering of the individual tread blocks then rotate asap and REVERSE the direction of rotation (switch sides). This will change the wear pattern and force the raised section of the tread blocks to smooth out. Regardless of tire brand, keeping tires on the same side for too long will cause scalloping or feathering.....The ONLY tires you cannot swap sides are the UNI-directional tires. I rotate my tires every 8K miles using a figure 8 pattern.....X pattern,,,, then side to side,,,,X pattern,.... then side to side (LF to RF, RF to LF, same for the rears). Been doing it that way for decades and my tires always remain smooth keeping them nice and quiet for the duration of tread life.
IF your tires are all nice and smooth with no high low spots or scalloping or feathering of any kind, then your womp, womp, womp issue more than likely is not with the tires. You could have a bad wheel hub bearing or bearings on one or more wheels.
My truck OE tires were the Bridgestone Alenzas. A damn good tire. However from my experience, the Michelin Defender LTXs are a bit quieter and a little smoother (same air pressure) when changing lanes and running over the mound titties. When looking at the specs the Michelins are about 7 lbs lighter per tire than the OE Alenzas in my size. Therefore a reduction of rotating weight. I get slightly better gas mileage with the Michelins.
Also suggest you go to tirerack.com and take a look see. They have a good variety.