So, husqvarna recommends around a 33:1 mix?
I used their online form to ask them about this twice and got no response. The third time I asked a simpler question to start with and followed up with what I really wanted to know.
Me: "What fuel to oil mix ratio to you recommend for the longest engine life of a Husqvarna 385xp used for chainsaw milling?"
Husq: "Thank you for contacting Husqvarna. The best fuel/oil mix will be the 50:1 ratio using quality 2 cycle oil that is designed for chainsaws, and use fresh fuel, 89-93 octane for best performance."
Me: "In that case I'm curious if you could tell me why one version of the US 385xp manuals (http://weborder.husqvarna.com/order_static/doc/HOUS/HOUS2004/HOUS2004_1140238-95.pdf
) as well as all of the manuals for New Zealand, Sweden, and many other countries recommend 33:1 for Husqvarna saws over 80cc? I assumed it was for longer engine life."
Husq: "The different ratio can be attributed to different fuel quality in the countries that you listed. The owners manuals for all Husqvarna products in the US call for a 50:1 fuel ratio."
That said, I myself use a 1 gallon Husqvarna mix in .85 gallons of Super Unleaded from the local Exxon station that has one hose for each grade in a new saw just incase the rumors of conventional oil leading to a better breakin are true. After that I switch to 3oz of Mobil 1 racing per US gallon. That both makes measurement easy and gives me around 42 2/3:1.