Energy funds are well full of energy. PCRIX is no load and exp ratio <1 and offers broad exposure to all commodities (it is a bit weighted towards energy but the Energy Funds do not includes cocoa, sugar, etc.)
Energy Fund to me is more of a play on stocks than commodities. They have a higher chance of moving in the same direction as stocks than actual commodities which should move opposite the market. PCRIX seemed to offer more bang for my buck in terms of diversification. It has been fairly consistent in terms of market up fund down, market down fund up. So far I am pleased.