I hiked the entire AT with a Svea 123 and used unleaded gas probably 90% of the time without any problems. I cleaned it regularly and replaced the original orifice with a self-cleaning one. After I finished my AT hike I gave the Svea to my brother and bought a Coleman multi-fuel stove. I used that mostly with white gas but occasionally used unleaded. Still have the Coleman. I used a alcohol stove on my 2010 AT thru but since then I have gone stoveless.