What oil does Wendy's use?

Online Answer
Vegetable oil Wendy's vegetable oil includes citric acid (called a preservative on Wendy's site) and dimethylpolysiloxane (described by Wendy's as an anti-foaming agent).
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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.