Does Wendy's fry in peanut oil?

Online Answer
Most of the time Wendy's cooks their fries in vegetable (soybean) oil. They also cook their nuggets, chicken tenders and crispy chicken sandwiches in vegetable oil in a separate fryer. They cook their home style and spicy chicken sandwiches in a pressure fryer that uses canola oil….
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Judging on taste alone, the Wendy's burger is the clear winner over McDonald's. The beef tasted better, and it had better toppings (aside from the overabundance of mayo). My co-taster agreed: "The Wendy's burger, easily." We both also preferred the Wendy's fries over the McDonald's fries, though that was a closer call.