The Trail Grapplers that I have are M/T however they are fairly quite in my opinion and look great. I wanted the stock rims w these tires also so I wasn't flying rocks all over the side of the rig and thus far (3500 miles) it's accomplished that. Can't say how long they'll last but from what...
Yes I live in MN and use Bio as well and I do think that lowers the mpg as well. After my update it improve milage by at least a couple mpg though. Not sure about the dep consumption yet but before the update it was for sure fairly high.
I have a 2021 rubicon diesel built the end of July, w steel factory bumper. I had the 6378aa spring on the left side (drivers) and the 6377aa spring on the right side (passengers). I have since installed the mopar 2” lift.