Yes, leaf blowers do take mixed gas. The engine of a leaf blower is typically a two-stroke engine, which requires a blend of gasoline and oil to function correctly. The typical ratio for this mixture tends to be 40:1 or 50:1, but it can vary depending on the manufacturer's recommendations. This means for every 40 or 50 parts of gasoline, there should be 1 part of oil. The recommended octane rating for the gas is generally 87 or higher, and the ethanol content should ideally be 10% or less.