I got a set of Nitto Terra Grapplers in 295/70r17 mounted on my truck and I am curious what tire pressure I should run them at. I had the shop start them at 40 psi but I'm pretty sure I am already seeing a drastic drop in mileage since I got them installed. I would rather have them higher since that should keep my mileage higher. They are good to 65 psi. Would it be a pretty rough ride to increase them to about 50-55 psi? I will be driving a 3000-mile trip starting next month and I want to optimize my mileage as much as possible before then.