There are a few designs under this category, is actually more of a 4 stroke plus 2 with the extra so called cycles coming from a moveable cylinder head/piston. Don't know of any in production/in use. see link below for more info.
Invent
high cost
I'm not aware that there ever was such an engine.
This is a new and emerginf technology and needs to have a lot of research work for this.. so we have to study about this new technology too. Like the innovative design of NIYKADO Six Stroke Engine.
2 stroke and 2 cycle mean the same thing
any gas station. its called gasoline There is such a thing as a 2-stroke or a 4-stroke engine, but the fuel is the same (gasoline). The difference being that the 4-stroke engine uses regular gasoline straight from the pump while on the 2-stroke engine you have to mix 2-cycle oil with the gasoline.
Explain the advantages of four-stroke engine over two-stroke engine
There have been many examples of a 350cc two stroke engine made over the years. Kawasaki and Yamaha motorcycles used this type of engine as well as many other manufacturers.
two stroke
Why the fuel consumption is less in 4 stroke engine as compared to 2 stroke engine
There is no difference, they mean the same thing.
in my opinion a two stroke engine is a better quality engine as compared to a four stroke engine!