If its a usual trick one should be able to find some usual examples. I've never encountered a bottle of oil in the US suggesting its olive oil when its really a blend. Maybe I've encountered a bottle that had a picture of an olive in the background along with other vegetables, but never something really trying to suggest its "olive oil". They almost always just have generic vegetables on them or soybeans or whatever. Can you share an example with me?

Oh you gotta start shopping at the discount marts.