On Thursday, November 5, 2015 at 9:51:25 PM UTC-5, wrote:
But here in the East we rarely go high enough to need oxygen

A physiologist pointed out to me that a pilot's performance will often benefit from supplemental oxygen well below the levels stipulated by the FAR. If you have an EDS system, you might start to use O2 at a lower altitude than you anticipate.

Related, Dr Dan wrote a good article about the reliability of using a pulse oximeter to evaluate the efficacy of your supplemental oxygen system:

http://www.danlj.org/~danlj/Soaring/...-p18-20-22.pdf