Two-Stroke Fuel Mix
Oil to add for a two-stroke gas:oil mix (chainsaws, trimmers, outboards): oil volume = fuel volume / ratio, reported in fl oz and mL with the per-gallon and per-liter dose (first-principles volume arithmetic).
Formula and source
oil volume = fuel volume / ratio (gas:oil by volume); 1 US gallon = 128 fl oz; 1 fl oz = 29.5735 mL; oz per gallon = 128 / ratio.
Two-stroke fuel/oil mixing by volume ratio; first-principles volume arithmetic, public domain. The oil grade and ratio are set by the equipment manufacturer.
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