You can use what you like !!
I use regular olive oil for frying...garlic ...onions etc but I wouldn't dream of frying egg and bacon in it !
It can burn at a very high heat which is why you see see chefs add butter to it sometimes .
The International Olive Oil Institute recommends using pure olive oil for frying, since the flavor of extra virgin olive oil tends to break down at frying temperatures, making the added expense a waste.
Having said that EV olive oil will add more flavour to what you are frying ..but I still like my egg fried in sunflower oil !
Have a look here
http://www.internationaloliveoil.org/tm/canada /askus.asp?lang=english#10