I have all 4 5100 and in the front leveled it out.
I love the ride and handling now it feels like a different truck! If you can get all 4 it's worth it.
Also I paid 300+50 to have the crash bars cut
I have 285s on mine with 0 offset and had to remove the rear crash bars and trim my front not much help but just an idea.
If you can go with a 25offset or so that would be better I personally love the way my set up looks besides wanting to go bigger lol
Honestly if your worried about MPG don't lift a truck and on top of that put bigger tires that also weigh more. You ether lift it and don't worry or keep it stock and try to drive the best you can to maximize mpg.
If you look at my thread 2 down from yours you'd see they are great but I to am dealing with vibration due to one tire but america's tire is ordering me a new one.
They are great but my next tire will be general grabbers.
Update!
Well went to my appointment and 3rd time was not the charm they said it's way off. They said if I feel any vibration to call them and they would replace the tire (2500) miles on existing. As soon As I left I felt it and called right away it was worse than when I went in.
The guy was...
I'm not complaining because it's bound to happen and I haven't heard of any Toyo AT3 balancing issues.
But when I first had them mounted I had a shake took it to American tires and the re balanced them still shook. I went back after work and they said they made the mistake and fixed it. However...
Do you feel it gave you an actual 3" lift? I only ask because the description said paired with the eibach shocks it will give you 3" on the lowest setting. I'm just wondering if the 5100 are about the same?
If so that's a deal to get 1 better springs and get an extra .5" so it sits perfectly level