Yes.
When you mix regular unleaded fuel and unleaded plus fuel in a gas tank it results in a mixture of fuel with an octane rating higher that regular unleaded fuel but lower than the octane rating of unleaded plus fuel.
no you dont have to its a 4-stroke it runs on unleaded fuel no mix
If you have the Flex Fuel Vehicle ( FFV )
If you mean a CR 125R you have to mix 2 cycle oil and premium gas
Yes
yes but most motorcycles run best on the middle grade fuel
Briefly. If you make a practice of it, you will destroy your catalytic converter. Where on earth did you find leaded gas these days?
Yeah it shouldnt hurt anything
Yes as long as you mix the oil with it.
I always put the oil in the container and then pump in the gas. Mixes fine!
Yes, you have 2 options. First, mix in some lead substitute with any tank full of unleaded, available at most parts stores. Seond, you have to remove the cylinder head(s) and have a machine shop install hardened valve seats. Then, you can use all of the unleaded you want. The reason for this is that in the pre-unleaded days, the lead in gas served as a lubrication for the valve seats. When the wonderful EPA banned leaded gas, the lead-lubricant was gone. The car makers compensated for this by hardening the valve seats, making lead uneccasary. However, using unleaded in cars bult before about 1974 or so will result in fried valves/ valve job. I'm told that the notoriously bad valve life in old Volkswagon beetles was a direct result of unleaded gas being run in these engines.