I have the Ryobi P747 inflator with auto shut off. Just part of my routine of at home servicing to double-check the tire and spare PSI and adjust as needed. No more than 8-10 mins for 4 tires and around and the same to drop and check the full size spare w/ no TPMS. I set my full size spare to around 42-45 PSI since it will drop a few PSI a month and I only need to double-check a few times a year. I usually set my tires PSI 2-3 higher in winter because of morning-to-afternoon temp swings of 25-40 degrees F in early morning shade compared to afternoon direct sun (want to avoid TPMS warnings below freezing temps). Whatever the PSI in my heated garage usually means a lower PSI once I roll out and hit the road in winter temps. I lower the PSI to the recommend range in late spring and summer like temps (March to October months)

Never really thought about going with 100% nitrogen since normal outside air is already 78% nitrogen?

 

If adding or subtracting a little air in your tires twice a year drives you crazy, I simply don't know what to tell you.
I check the air in my tires and add/ subtract as necessary at least once a month.

 

Didn't we have a really long thread about this exact topic already?

Tldr nitrogen fill doesn't behave appreciably different than air due to temperature. Because air is 70% nitrogen already...

 

Typically twice a year - add air when winter sets in and let it out when its summer.

 

If you're seeing more than a pound or two fluctuations every few months then, something is wrong. There has to be a slow leak somewhere. If your pressure increases other than due to significantly higher temps, something is really wrong. Most likely with the measurement.

 

Definitely don't fill your tires with oxygen - they'll explode.

I think the nitrogen tire fill is a gimmick for the reasons stated that normal air already is mostly nitrogen.

Like 'MrGold' I carry a tire inflator around in the vehicle. I have an inexpensive one from AstroAI that's cordless and makes it really easy to add air to the tires. It's only around $65.

Amazon.com

I just keep an eye on the tire pressure display in the vehicle and if it gets a couple psi off (cold) from the spec (35 psi for mine) then I top them up. I live in a mild climate area so mine doesn't swing as much as yours on the cold measurement (like after sitting overnight) but I wouldn't worry too much about the swing - just maybe adjust them once a month or so, or maybe before a big road trip. Mine I only do about every few months but again, I live in a mild climate (San Diego).

 

All my replaced tire services have been done by Costco so far, so it is nitrogen filled. My 2019 MDX is still on original shoes, so it is whatever from manufacture. But I did top with nitrogen air from Costco few times over the winters as needs.

 

with large temperature swings pressure goes up or down, do any of you have 20 deg temperature swings with is a day or two, im not talking about twice a year it may be 5-10 times in a month its allot, either take air out or put it in

 

For winter, I'll set pressure to 38 lbs when it's 15 degrees (F) or so - that will cover the winter range of 40 to -20 degrees.

I've lived where daily temperature swings of 45 degrees are not uncommon or where you may start out in the mountains in morning at 15 degrees and 90 miles later be in a valley with 85 degrees.

I don't overthink things....

 

You're over thinking it. Set the pressure to the spec when it's cold in the morning and just leave it.

 

From the Tire Rack website:

Should I Use Nitrogen In My Tires?

Those who would respond "TL;DR" need only to read the last sentence:

Rather than pay extra for nitrogen, most drivers would be better off buying an accurate tire pressure gauge and checking and adjusting their tire pressures regularly.

 

One problem with nitrogen is that it's not convenient to top up the tires when needed unless one happens to have a tank of nitrogen in their garage. With air it's very easy to top up and it's free. Using the portable cordless inflator I linked above allows it to be done in maybe 3 minutes for all 4 tires (but don't forget to check the spare every now and then as well). I have a bigger shop type compressor I used to use for this but this little cordless one if far easier and quicker to use.

I just used one on a different vehicle that had been sitting for some months and it managed to pump all 4 of those tires from 20psi to 35psi in a short time and all within one battery charge on it.

 

I normally top mine off either whenever the tires are below the cold PSI or I’m at Costco filling up fuel. Even these days, I see Costco doing the whole nitrogen gimmick as well when doing the tire service.

 

Nitrogen in passenger tires is just another excuse to overcharge you. Nitrogen is used in racing car tires, I think to eliminate the oxygen and hence fire potential, but is basically worthless to us. Just like a placebo, those who have nitrogen swear that the pressure doesn't vary as much, but that would be re-writing the gas laws. In practical terms they are the same. Please don't fall for this scam. Buy a 12v tire pump and an accurate tire pressure gauge and adjust occasionally. While you are at it buy a tread wear gauge, or learn how to use a penny to measure tread gauge (I never keep pennies anymore).

 

I can't believe people still fall for this.