So where does everyone get their tires filled up at? Would this mean that a home air compresser, which are small, also has the same problem?

not if it has a humidity/water catcher built in. usually a small tank off to the side.

define small compressor?

Small compressor would be one that doesn't have a storage tank, i.e. portable tire inflater. A home compressor you would use with air tools has a storage tank and due to compression most of the water goes to the bottom of the tank (and rusts it out but that's a different issue), additionally it is very simple to add an inline water filter.

I normally use a compressor at home (18 gallon tank, got it Home Depot during a killer sale and this is about all I use it for).

My Z came with some BS nitrogen fill - does anyone know anything about this? I haven't had to add any air yet, but am curious as to what I should do when it needs it. The dealership is the only authorized dealer (can't remember which company it was) in the area and their make-ready is the only place to get a fill.

you can safely mix regular ole air with nitrogen inflated tires, however, the main reason nitrogen is used is because the molecules? (im no physicist) are larger, and thus dont leak out of tires as easily. at least thats what i remember from the one science class i took years ago in university.

so in essence...if you have nitrogen filled tires, you shouldnt have to really fill them, UNTIL you get an unnatural leak (hole in the sidewall caused by a nail for example)

Air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.

The main benefit to filling your tires with nitrogen is that it is lighter then air, which is supposed to increase your gas mileage. But as mentioned it also does not leak out as fast, there is also less affect from varying temperatures which means your tire pressure will remain more consistent. If you can get them topped off with nitrogen for free and without to much hassle you might as well it's certainly not hurting anything, but again regular air is largely composed of nitrogen anyway and there is no harm in "mixing" them.

OMG !!! CAN you not read? air is 78% nitrogen....lol........so much fake science in this thread........
Hey ...why not fill your tires with Helium? they you could lift off the ground........lol

Sorry CRASH1369 not aimed at you.....

uh, ok. good cuz I was pretty sure I was agreeing with you when I said air was mainly nitrogen anyway. :p The rest was just the reasons why they say it is superior, if it really makes a difference or not is debatable.

get your facts straight. there's no fake science in this thread. if you actually bothered to google, as i just did, you will see that nitrogen molecules are in fact larger than normal oxygen molecules. pure nitrogen inflated tires will leak less and are less susceptible to temperature/psi variations as well as being lighter than your typical air (4% lighter, however fuel savings are negligible at best). while our air is 78% nitrogen anyway, the rest of the gases you fill into your tires will find their way out faster, hence why pure nitrogen is used more commonly today.

The molecular size differential is 3%. The only reason the Nitrogen scam works at all is because the Nitrogen they sell you is dry. The key to consistent tire pressures is to put in a dry gas, whether Nitrogen or regular air. Fuel savings comes from having consistent tire pressures, nothing else.

Easy killers, the only reason to fill your tires with nitrogen is as mentioned above, because it stays in the tires longer (NOT because it is lighter lol). either way, its a rip off. Back to the subject, when I mentioned a small compressor, i meant like a 5 gallon tank or something like this:

Amazon.com: Porter-Cable C2002-WK Oil-Free UMC Pancake Compressor with 13-Piece Accessory Kit: Home Improvement

I have a local shop that fills my tires with nitrogen for free. I think they're standard charge is 7 bucks a tire (nothing compared to the dealership charges). I've ran Nitrogen in my tires for 6 years now and have never had to have them topped off. I know it's subjective as to whether or not it's beneficial, but I have never had any leaks since switching to Nitrogen.

Disclaimer: Some will say that a properly installed tire won't leak air either but the fact is that I've never had a car not leak air and I've never had a car leak nitrogen.

your good to go with that set up!