I've said it time and time again but I'll say it again for the purposes of this thread.
My 91 regular cab 4WD 22RE 5sp on 235 w/ steel wheels got me 400 miles to the tank. Exactly 100 miles to each 1/4 mark.
As soon as I went to the very heavy 30" BFG AT I lost just over 100 miles per tank.
I was straight highway driving from Richlands NC 75 miles a day, 900 miles a week to Wilmington NC.
So I checked it regularly.
I never would have thought going from a light weight 29" street tire to a heavy BFG 30" AT would have resulted in that. Just imagine what it would do with aluminum wheels and light weight street tires
As cheap as wheels and tires can be you need two sets. One set of aggressive tread for off-road. They tend to weigh more than light weight street tires and the street tires will last longer. And one set of street tires. Shuffling the two will result in them both lasting longer.
I was and will be doing this for a winter AT type tire and a summer light weight street tire.