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.
Yes, you can. It is even sold as a Synthetic Blend.
If it has a separate place for gas it uses no mix.
Yes.
Yeah it shouldnt hurt anything
The most that will happen if you put mixed gas in a regular fuel engine is (depends on how much mix is but ) it will smoke out the exhaust and fowl the spark plug or may not run at all.
If you have the Flex Fuel Vehicle ( FFV )
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?
Depends on how long it was run on regular gas and how much damage occured to the engine when it was run, empty the tank and put the proper pre-mix gas in it and find out.
If you mean a CR 125R you have to mix 2 cycle oil and premium gas
Nothing If your car runs well on regular fuel then you will see no change with plus fuel except it will cost you more. If you have problems with pre-ignition or "pinging" the plus fuel with it's higher octane rating will reduce or eliminate the pinging.