BlackBoost

I don't lose tire pressure until it gets cold, which is normal. I'm normally around 37 once I've been driving a bit. 35 sitting still overnight, and 38-39 driving on really hot days.

Spring and fall I change my own tires. First thing I do is set my pump to 35 PSI and hook it up to one tire at a time. It automatically puts in the pressure I set and shuts off on its own. I've never checked what the pressure is when I do it because as long as it's not obviously flat, I don't really care. While a tire is getting air I'm busy taking one off the truck.

The TPMS sensors are a nice touch, and I check that screen at least every other day, only takes a second. If I'm on a slanted/odd road that makes the drive feel funny, I find myself checking the screen as well just make sure it's the road and not a low tire.

All Hat No Cattle

As I said, uninformed.

Now, if you have access to 100% dry compressed air, and use only that to fill your tires, you don't need nitrogen.

If you don't, well...

http://www.gonitrotire.com/nitrogen-...ms-your-tires/

But never mind facts.

OP, as I said, don't believe me or anyone else, find out for yourself. Take the nitrogen out of one tire and put air in it. You will notice the difference in hot tire pressures immediately.

If you don't notice any difference in pressure fluctuation between the air and nitro tires, then you have to wonder if they actually put nitrogen in your tires.

But that could never happen at a dealer, right?

I have to maintain 28 tires on my property. I've done it for years with plain, old, air, and then Costco sold me a set of tires with a free nitrogen fill. I had the experience of checking my wife's Caddy SUV tires right next to my Expedition in the garage.

http://tires2.costco.com/Home.aspx?whs=673

WTF? How come I'm always adding air to her Michelins, and not to my Michelin/nitrogen tires?

So I bought my own nitrogen bottle setup off Craigslist, and never looked back. Life is too short to screw around with a compressor any more than you have to.

But, to each his own. Some people don't mind the extra work of airing a bunch of tires. I do.

Livoniabob

This got me counting,,,,, I come up with 64,,, Sorry now that I counted... I use my air compressors to keep them full,,,, including my wife's car with the Costco nitrogen filled tires,, Which are the ones I have to top off the most often..

VTX1800N1

You can dispute physics all you want, but you would still be wrong. BTW, you don't have to be an *** to make a point, but in your case it's clear that's it's the choice you prefer.

Golfman454ss

There is your mistake, taking a vehicle to Costco for anything!!!!!!

BlackBoost

Yep, and he's still convinced lol Because you know all the "scientists" at NASCAR know their stuff LMAO

E. Manuel

Uh, yeah they do know their stuff. That's why they use different circumference tires on oval tracks (outer tires vs inner tires) and even group them to within 1/10th of an inch in each tire set, and yes, they use nitrogen!

http://www.nascar.com/en_us/sprint-c...ogy-tires.html

lumpythetexan

My wife's Chrysler 300s came with nitrogen in the tires, by the problem is each and every oil change (4k) we also asked for the tires to be rotated and balanced and guess what no dealer in Tucson has nitrogen, so could not properly adjust the air pressure, so I said please remove it and put in regular air into her and some days they can read a little low in cold weather, but once they get up to temperature they are fine. In my humble opinion it ism a scam and not worth the price.

E. Manuel

So you had them remove 100% nitrogen to put in 78% nitrogen? Why not just top them off with air???

All Hat No Cattle

Too uninformed to realize that he is.

Excuse me if I decline to discuss physics with you. I suggest that you Google relative molecular size of oxygen, nitrogen, and water vapor molecules as it relates to their dispersion and transmission thru rubber. Tell us what you discover.

But, of course, you won't, because that would be like, well, work.

Out of mercy I'll give you a hint of what you will find, LOL.