.For those that are quoting higher MPG and are runnning larger than stock tires, is your speedo gear corrected with correction gear or a Yellow Box?
My high mileages were with the 275/70 or whatever Michelins.
Low mpg was with the 255/80s. Don't remember if that was corrected or not, but I'm running the Slee drop-in gear, reads about 2 mph slow at 60. When it's low like that, correction isn't really worth the trouble to me.
I'm slow at math, that's why I'm a historian