One consideration is that below 30 psi and you'll have a constant TPMS warning.
Not really the case. Just so we are all talking the same language, this is what I mean when I say "Initialize the tire pressure warning system:"
Procedure might be slightly different depending on model year and whether LC200 or LX570 (consult your owner's manual), but the principle is the same for all models.
One can inflate the tires to any pressure(s) one wants. For example, I set my for in use tires to 40psi, but my spare is set to 80psi. After I initialize the tire pressure warning system with these pressures, the low pressure alarm will trigger when any tire goes 25% below the pressure set when initialized. This means any tire which was initialized at 40psi would trigger an alarm when its tire pressure reaches 30psi (25% below set pressure), but the spare tire would trigger an alarm when its pressure reaches 60psi (25% below set pressure).
The point is, each tire is initialized independently and triggers an alarm independently from other tires - regardless of set pressures.
Conceivably, one could set one pressure for the front tires (e.g. 40psi), a different pressure for the rear tires (e.g. 46psi), and yet a still different pressure for the spare tire (e.g. 80psi) and then initialize the tire pressure warning system with those pressures. In this hypothetical scenario, the low pressure alarm would trigger at 30psi for the front tires, 35psi for the rear tires, and 60psi for the spare tire.
So... as long as the tire pressure warning system is initialized with the desired tire pressures, even if one is significantly lower than the other four, no low pressure alarm would trigger unless any one of the tires went below its individually set tire pressure.
HTH
