Any old person with an oxygen concentrator for emphysema or COPD puts out mostly nitrogen from the discharge end.

 

Moisture in the tires will raise the pressure drastically when the tires get hot.
Sure your butt might not notice when your pressure jumps from 35 to 42 psi, but check your TPMS in the morning and during fast drive.
Also traction suffers with big pressure change, that is why it is pretty crucial in racing.
As for comparing to scuba, my 1st class training included coming from 40m (130') dept with no air. It is not big deal once you control the panic factor.
Will you recover easy with lost traction in the car at 100 mph?

 

I'll bite.
Short of the vapor in the tires TURNING TO STEAM (at which point I'll wager you have significantly bigger problems, it isn't going to make much if any difference in the pressure inside the tire. Physics says that gas will either expand or go up in pressure when it is heated. Could be air, pure nitrogen, CO2 or my farts. Doesn't matter.

https://powertank.com/pages/nitrogen-truths-and-myths

Edited to add: Dry nitrogen might expand slightly less than the air we breathe and thus cause a smaller change in tire pressure in a racing situation. However, in a racing situation EVERY advantage you can get is what will get you to the checkered flag first. The real world doesn't care.

 

I see what you did there. Don't know what use the 12v outlet in the trunk is really for. Now I see it's also good to use in case you have a refrigerator/freezer in the trunk. Maybe I'll pick up a small one. One thing about having a cordless battery inflator like the Ryobi is that you don't have to plug it in. I use the 4mah battery so it lasts a long time. I can fill up all the tires several times and the battery hardly drops a bar and it's still fine even in the winter. And yeah, nitrogen is pretty over rated in the US. Never had a tire rust out from using regular air.


The only problem with those no name cordless tools is that the battery is only good for that particular tool and it's not like Ryobi that has 260+ tools that will take their 18v battery. And their battery design hasn't changed so your 15+ year old tool still takes the same battery. I have a bunch of the other ones like the vacuum, drill, light, sawsall, impact wrench, etc.

 

Concur. Ive had my truck tires 295/70-18s always filled by whatever air source, they last 75k miles, go thru whatever, no issues ever.

Heck back in the day used to buy used tires as cheap as I could for my 68 mustang, burn out rear ones and see where I could get the next set with some tread on em.

I can see a nitrogen fill for some sort of extreme race condition where every mm counts (and even then probably dont matter) but other then that no difference.

 

I ordered one. Thanks, OP.