CVR Energy contributes more than 75% of Icahn Enterprises' top line, but you'd be better off with one of these two energy giants instead.Icahn Enterprises (IEP 1.95%) is a unique conglomerate, but it gets categorized in the energy sector because over 75% of its revenue is derived from its controlling stake in CVR Energy. Add in its dividend, which at current share prices yields a massive 23%, and it's easy to see why income investors looking for exposure to the energy sector might be interested in Icahn Ent ...