You can avoid that loss of detail on onX if you add a satellite receiver unit, such as a Garmin InReach, to your vehicle.
Having Apple CarPlay or Android Auto helps somewhat as well. Use it, depending on your phone type, to display your map from the phone to the head unit.
Not bad on rock but much slippier on them due to the hard rubber lugs with no siping.
In deep sand, such as all the washes we drive through here, they just dig down into the sand vs. track over it.
Really, they are not that great for the conditions here.
A wider tire may also be heavier, so it adds weight which affects mileage.
Further a wider tire creates just a bit more wind resistance which also affects mileage.
How much that translates into mpg loss is dependent on a lot of variables.
2021 Willys purchased on 2/5/2021. Came with the white lettered Firestone Destination M/T tires.
Hated 'em. Worst darn tire for offroading in this part of the world. Changed them out within a month of the purchase date.
Those look like Fuel Beast wheels, marketed by MHT, with a +1mm positive offset. MHT/Fuel shows that for a 5x127 lug pattern wheel in 17", they are a 9" wide wheel with a 5.040" backspacing.
Here is a link to the MHT/Fuel 1-piece wheels:
Fuel Beast 1-Piece Wheels
I didn't like the long, mushy take-up of the clutch in the current Wrangler JL. The shifter throw from gear to gear seemed vague as well.
I drove a V6 manual, a V6 auto and a 2.2L T with an auto when out shopping for my Willys. I decided on the 8-spd auto with the manual shift feature. It's a...