46 psi is likely ok, and there are people who do run that much (or more) for extra range, but if you want peace of mind, I'd go with 40-42psi. I suggest to people that they run 90% of the maximum pressure rating on the sidewall. That would be 45 psi in your case, so I wouldn't worry about 46. Most tires are rated for 44 psi, which means in most cases it's no more than 42.