We did not find any white gas in La Paz. We heard that one trekking agency in La Paz sells white gas (but too late for us)
Ancohuma's official ranking is number 21 in South America.
Bring a multifuel stove. Kerosene and white gas (bencina blanca) can normally be found in the auto workshops and painting shops.
The elevation controversy has been put to rest. In 2002, OWA of Colorado guided a group of teenagers, to the summit and confirmed the actual height of Ancohuma to be 6425 m +/- 2m. The project was sponsored by Trimble and OmniStar and overseen by Jerry Brown of Bear Creek Surveying in Durango who has now mapped the Colorado Trail 3 times and rediscovered the lost Silver Trail in Copper Canyon, Mexico. Here's the link to the full story --http://www.bearcreeksurvey.com/anchouma.htm
Try these: 15.854°S / 68.542°W