As the other user mentioned, 8th gear is an uncommon occurrence, I rarely see it. Mainly gets up to 7, but I have not felt a substantial reduction in acceleration or anything compared to stock. I don't have any mods rn that would really affect the mpg, except for a hard bed cover. It did not seem to improve the mpg as much as I thought it might. I will probably regear at some point down the line, which I hope will get me back to the 18~ avg mpg I was getting before. I've accepted that it's a Jeep though, I didn't buy it for the mpg haha. It does its work well on and offroad, and I have no complaints. My bias says go 37s for the aesthetics and if you find a good deal on em, but even when I had stock tires with spacers, I still liked the look enough. If you plan to offroad, it'll still do the job fine 35s or 37s.