Tire Rack says it best;

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=191

Mike B.

On Sat, Mar 10, 2012 at 2:12 PM, Dave Mcneely wrote:

> ask the tire shop personnel what the nitrogen does for the tire.  the
> looks will amaze you.
>
> as most of us know, air is about 80% nitrogen.  most of us should be
> checking and probably adding air to our tires no less often than
> monthly.  I simply use a bicycle pump for my cars, and a small
> electric compressor (the sort sold at auto supply stores to carry in
> the vehicle) for my camper.  for shops to sell nitrogen is mostly a
> scam.
>
> mcneely
>
> ---- Dennis Haynes <d23haynes57@hotmail.com> wrote:
>> Nitrogen for tires can be a good idea especially if the tire shop has
>> oily or wet compressed air. Ask the tire shop if they do anything to
>> ensure the oil from the compressor or the water from the compression
>> process does not get into your tires. The looks will amaze you.
>>
>> Dennis
>>
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
>> Behalf Of Dave Mcneely
>> Sent: Friday, March 09, 2012 2:32 PM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: Re: Spark plug gap
>>
>> I think the next time a tire shop offers to fill my tires with
>> nitrogen, I'll ask for some of that "seasonal air" instead.  think
>> that'll get a reaction?  mcneely
>>
>> ---- Angus Gordon <birdworks@GMAIL.COM> wrote:
>>> Thanks for the link George. I've been looking for one of these left
>>> handed metric screwdrivers for some time now -
>>>
>>>
>>> <http://kalecoauto.com/index.php?main_page=product_info&cPath=5&produc
>>> ts_id=21>
>>>
>>>
>>>
>>> Angus
>>>
>>> www.wordless.me
>>>
>>>
>>>
>>> On Fri, Mar 9, 2012 at 8:19 AM, george jannini
>>> <georgejoann@gmail.com> wrote:
>>>> Try these, no gap required:
>>>>
>>>>
>>>> http://kalecoauto.com/index.php?main_page=product_info&cPath=2&produ
>>>> cts_id=5
>>
>> --
>> David McNeely
>>
>
> --
> David McNeely