Optimal tire PSI for max range?

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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.
 
Be aware that tire pressure gauges are not noted for their accuracy.

Side-to-side balance is important for steering. Low pressure leads to over heating and excess wear.

I agree with LeftieBiker's statements above. Run a few PSA above spec. I run mine at 40.
 
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