[joe strummer]

Originally Posted by strat61caster

I fear I may have misinterpreted your post, oh well, already wrote it.

Not at all. Thank you for the explanation. Very interesting.

Originally Posted by strat61caster

Edit: Easy DIY test, take one tire filled with nitrogen (courtesy of your local dealership, costco, american tire, NASA, whatever) take one tire filled with atmospheric air (stop off at a gas station on the way home drain a tire flat, fill it up with the air compressor there), let them sit in the garage overnight, equalize the pressure in the morning, let 'em sit in the sun for a few hours and measure the pressures again. You could be fancy and measure every half hour and make some nice Excel graphs, of course make sure they get equal sunlight and aren't close enough to influence each other significantly.

Or I can take your word for it.