I put the 19. 5s on this week they are 245/70/19. 5s and only 4. 08% off from my stock tires. I have 65 psi in the front and 55 in the rear. You can definitely feel the difference in the stiff side wall it hits the frost heaves a lot harder. I am not looking for mileage gains, not that I would mind. I will be heading down to Blairsville PA. tomorrow so I will get A good idea how they are on a trip... . George