best butane for oil?

i am guessing 8. EDIT: that is actually based on something. it would appear that this is your first attempt at doing this, so you won't be as efficient as you could be. I am also assuming that you are using a that is well suited for this type of extraction (a resinous/oily strain) so it wont be a horrible yield. BHO isn't known for great yields to begin with though, so i thing that 2 grams/ounce of sugar leaf is a decent result that with time could go as high as 2.5 under the right conditions.
 
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