This article from Hagerty has data on changes to mileage etc. when installing larger tires. I thought people might find it interesting.

https://www.hagerty.com/media/drivin...adventure-rig/

 

The only problem I have with the article is the rpm difference between sizes. Simple math tells you that a bigger tire will turn less rpm's over a distance. This also means you will have less torque to the road, hence the slower times in the 0-60. I do agree the drive train has to work harder to turn larger tires, thus the less mpg's. To be honest, I wasn't impressed with the article.

My experience going from 31's to 33's was less power to the ground, mpg's suffered, but off road was a non-issue, especially in 4lo. Handling on road suffered quite a bit, from handling to power. I dropped down to 32's and life has been much better. If I ever go up to 33's again, doubtful, I'll regear to 4.11 gears. I'll lose mpg's I'm sure, but the power will be better.

 

Your points about the reduced torque was why I was ok not going with the 31s and sticking witg the 30 inch tires.