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Do you have to use 91 octane gas in a 1996 Cadillac Deville?

No, a 1996 Cadillac DeVille does not require 91 octane gas. It's designed to run perfectly well on regular unleaded gasoline (typically 87 octane). Using higher octane fuel won't hurt it, but it's unnecessary and a waste of money. The owner's manual will confirm this.