I have Full-time 4wd and driving up steep grades onroad, my trans temps never move from the norm. Even when lugging the crap out of it and gassing it up the hill. I've done some light trails at about 5000ft and left it 4HF and never had any issues with trans temp. Granted my truck has a...
As you drive more and fill up your tank more the average calculated tank range gets better. Mine is consistently showing 350 miles now before E at approximately 22 mpg. Hybrid iforcemax.