Re: Olive Oil
"olive oil" is extra virgin olive oil (evoo) diluted with another oil.
I would also say cooking and stir frying are two different methods and require different oils. Olive oil has a relative low smoke point in other words, it will burn over higher heat. Its great for low heat cooking though. I use bacon grease if I want something higher heat. Research smoke points for oils and you should come up with a list of different oils and their appropriate cooking temperatures.
I think typically people use high heat for stirfrys. To get around that, I will cook my veggies with a little water in the pan until they are almost finished, and then i reduce the heat and add a mixture of evoo, peanutbutter, soy sauce, and a little red wine.