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I personally think it's more important to always have tires filled properly, and to really do that you need to fill with air, not nitrogen, so that you can always top off whenever needed.
I always find it convenient and free to top off with nitrogen, so I'll just keep doing that, despite your insistence that I can only do it with air.
If it's free, that's much better and may be worth it, but then the situation arises thus:
- You fill the tires with (free) nitrogen.
- The temperatures drop, along with that the pressure in the tires.
- You want to bring the pressures back up for efficiency, ride, and handling characteristics.
- You now have to find a nitrogen source, which may not be readily available.
Nitrogen filled-tires can kind of lock you into the dilemma of 1) do I fill the tires now with air, contaminating the nitrogen fill, requiring drain and re-fill later, or 2) wait and fill with nitrogen later, but drive until then on under-inflated tires.
I personally think it's more important to always have tires filled properly, and to really do that you need to fill with air, not nitrogen, so that you can always top off whenever needed.
Why can't you add air to nitrogen filled tires?
You can of course, nothing bad will happen. But you kind of defeat the purpose of the nitrogen fill.
1. Nitrogen is guaranteed to be dry (no water vapor), and if you top off with air, that's not guaranteed to be dry. (It can be depending on the drying equipment in the air compressor system, but that varies).
2. One of the purposes of nitrogen is to eliminate oxygen from the inside of the tire, this supposedly reduces corrosion potential and rubber degredation. By topping off with air, you introduce oxygen into the tire.
If you paid for the nitrogen fill in the first place, introducing air means you'll have to have the tire drained of the mixed gas and refilled with nitrogen in order to restore the nitrogen benefits. In many cases, this incurrs a cost that you otherwise would not have had to pay if air was not used for the top-off.
You can of course, nothing bad will happen. But you kind of defeat the purpose of the nitrogen fill.
1. Nitrogen is guaranteed to be dry (no water vapor), and if you top off with air, that's not guaranteed to be dry. (It can be depending on the drying equipment in the air compressor system, but that varies).
2. One of the purposes of nitrogen is to eliminate oxygen from the inside of the tire, this supposedly reduces corrosion potential and rubber degredation. By topping off with air, you introduce oxygen into the tire.
If you paid for the nitrogen fill in the first place, introducing air means you'll have to have the tire drained of the mixed gas and refilled with nitrogen in order to restore the nitrogen benefits. In many cases, this incurrs a cost that you otherwise would not have had to pay if air was not used for the top-off.
It's awesome if that's available to you, but around here where I live it's not, as far as I know. Only major tire shops have nitrogen available, and they typically charge at least a few dollars per tire to fill. If I'm on a road trip or something, it would be very difficult for me to find nitrogen if I needed it.
My car was delivered with the tires at 47 psi.I'm driving around with 46-47 psi. The ride is smooth enough for the type of roads that I take, the wear on the tires are even showing signs of under-inflation. The energy consumption is pretty low, so I'm happy with this overall
My car was delivered with the tires at 47 psi.
There is no quantitative specification for mirrors and seats. There are engineering specifications for tires including pressure. Any dealer or delivery organization worth its salt will inflate tires to spec at the time of delivery. That is also specified on the door decal and on the tire sidewall. A car dealer or manufacturer will inflate tires to plus or minus 10% of the engineering spec.What a car is delivered with for tire pressure is totally meaningless.
Did you keep the seat and mirror positions too?
A car dealer or manufacturer will inflate tires to plus or minus 10% of the engineering spec.