Gearing and MPG - better or worse?

[Ken Sekley]

If I swap out my gears to 4.88 or 5.13, will my MPG go up or down? I'm towing a trailer most of the time and the truck seems to struggle. I'm trying to get a better understanding of what to expect. Thank you.

 

[Tripping4x4]

Hey dude, check out this video: