Why Olive Oil Passed, and Avocado Oil Did NotThe gap is not about the plants. UC Davis notes that avocado oil products in the study were priced comparably to olive oil products or higher. A product marketed as "made with avocado oil" may legally list several oils, and the study focused on products where avocado oil was the only oil named. The confirmed finding is that 48 of 54 processed foods labeled with avocado oil contained undisclosed, cheaper oils, compared with 1 failure in 20 olive oil products. Olive oil authenticity has been scrutinized and standardized for decades; avocado oil has not.