Their fries taste awful, so this won’t help.
I saved up a bunch of meat scraps and rendered them into a block of tallow. Made a batch of French fries the other night fried in that tallow. Tallow is amazing stuff: when hot, it doesn’t sizzle and flame, it boils like water instead. The fries turned out pretty good. I understand McDonald’s used to use beef tallow to cook its French fries.