The reason Nitrogen is used is because it eliminates water vapor issues
with freezing. Nitrogen is free of water vapor and "dry" air is as
expensive to generate.

On 10/20/2015 9:55 AM, Angus Gordon wrote:
>> PV = nRT ( T in Kelvin)
>> It's all you need to know Angus. For tires, balloons, business meetings :)
>>
> I knew I'd been missing something. It's all about hot air, says Alistair...
>
> Angus
>
>
>>
>>> On Oct 19, 2015, at 3:53 PM, Angus Gordon <birdworks@GMAIL.COM> wrote:
>>>
>>> Thanks David, I've been using a rule of thumb of 1% per 5F for a long time but I don't know where it came from. Michelin perhaps. Normally I only use it to overinflate when headed to a cold destination. Kept me out of the weeds so far...
>>>
>>> Angus
>>>
>>>
>>>> On Oct 19, 2015, at 3:46 PM, David Beierl <dbeierl@attglobal.net> wrote:
>>>>
>>>> At 11:19 PM 10/17/2015, Angus Gordon wrote:
>>>>> I have experience with nitrogen filled tires on aircraft and can tell you that it certainly doesn't negate pressure changes with temperature. That's still something we deal with. I don't see any real value in using nitrogen in car tires.
>>>> I believe pressure change as a percentage per degree will be essentially the same no matter what gas or combination of gases is used to fill a tire.  It amounts to roughly one psi per ten degrees Fahrenheit for tires at ordinary pressures and temperatures.
>>>>
>>>> Yrs,
>>>> d