if we are being picky ..
it's not 'by pressure' ..
it's by volume I believe.

OK....where was nitrogen in tires first used, and by whom. ?
or at least a good early example.

On 3/10/2012 4:05 PM, Dave Mcneely wrote:
> ---- Craig Cowan<phishman068@GMAIL.COM>  wrote:
>> The partial pressure of nitrogen in the atmosphere is 70+ %. You aren't diluting much if you have to add a few psi.
> Actually, it is 79+%
>
>> -craig
>>
>> On Mar 10, 2012, at 5:07 PM, george jannini<georgejoann@GMAIL.COM>  wrote:
>>
>>>    Hell why not helium for lower rolling resistance?  Or hydrogen, even
>>> lighter.  This is my Vanagon, I've named it Hindenberg...
>>>
>>> George/ATL
> --
> David McNeely
>