This makes me feel all warm & toasty. It's only -13 here this morning.

 

Nitrogen is 80% of regular air, using pure nitrogen isn't going to make much difference. Nitrogen or Air make a reasonable approximation to a perfect gas, which would lose approximately 1 psi for every 20F drop in temperature.

 

AM lows have been -16 & -22 the last 2 days here in Madison, WI.

My Mini doesn't seem to mind.

 

this morning the Mini showed -5 here in KY

 

The only thing that Nitro really does for you is that bottled nitrogen is very, very dry, whereas many compressors don't have good air driers on them. If you don't have dry air in your tires, you'll lose psi faster when it gets cold.

Overall, though, putting n2 in your tires is only the smallest step above snake oil.

 

Now I only know what I read in tech mags.

All the articles I have read say that N2 does NOT have the same pressure fluctuations with temp change as air does, that it does not retain moisture like air does, and is thicker so won't seep out of tires like air can.

The articles never went into the science and chemisty of it. They are magazines written for auto repair techs, and keep it pretty lay.

 

The water in the air will typically only be 1%-2% if that, so you'll lose another 1/2PSi when it freezes.

 

-30 out in the west suburbs of Chicago (Aurora) this morning... Brutal!!!

 

Hit a personal record this morning.

The last one was -16 back in 2005.

Thought I had a milestone at -25 on Monday.

Old man winter has other ideas about cold here!

 

-8ºC here in Kuwait last month around 5 am on my way to work!!!

 

you folks are making me feel warm and toasty! only -5 up here in Boston...

 

I had -14 here in Indy yesterday. Once the engine and oil gets warm, my MINI sure does like the cold, runs very very strong. But the mpg sure heads into the tank very quickly. I would imagine the computer is running the engine very rich at those temps.

 

Yep - forced-induction engines LOVE the oxygen dense air! Unfortunately, salty wet slippery roads, snow tires, and cold kind of limit the usefulness of all that horsepower! -13 in Pittsburgh, feels like a heatwave compared to areas north and west of here...