Here is a easy to remember chart.A guy I work with as a Bobbed deuce and a half with the multi-fuel diesel. Apparently the local park ordered 50 gallons of lamp oil for the cabins at the one park, and didn't realize they ordered lavender scented oil. Being that those cabins are heated and the lights are all runoff that oil, the lavender smell was overwhelming. They gave him the remaining 40 or 45 gallons, and he said he ran that and his truck smelled like a hippie going down the road, LOL!
I would love to buy that truck, but can't swing it financially right now, plus the Mrs said NO!
Back on topic, Kevin recommended I run 32:1 in the saw he ported for me, but my dealer said it would be too thick for my newer saws and weedeaters. I didn't want two different mix cans, so I met in the middle and run near 40:1. What I do is fill one of those little 1 gallon mix bottles up all the way, and mix that with a gallon of 100LL. New they are maybe 2/3 full at the 2.6oz mark, so I figure I'm somewhere between 3.2-3.5oz. I should probably actually measure it so I know for sure what I'm running.
4.0 ounces mixed with 1.25 gallons = 40:1------------------------------------------ 4.0 ounces mixed with 1.0 gallon = 32:1
8.0 ounces mixed with 2.50 gallons = 40:1------------------------------------------ 8.0 ounces mixed with 2.0 gallons = 32:1
16.0 ounces mixed with 5.00 gallons = 40:1------------------------------------------ 16.0 ounces mixed with 4.0 gallons = 32:1