Got the duals and went from around 15 to a little over 19. I'd probably get more but it's such a trip to drive, I can't help it. No regrets whatsoever. I agree with the tire pressure. check them often. One nail in a tire and you'll see your mileage drop. I keep mine at 42psi and they ride really well. Search what some members have done and you'll learn a lot-I have. Welcome!!