be careful with commodity funds. If you are referring to the ETF futures, these are fund that based on commodities and is not mean to keep long term. ^! J# x* G! i* r7 r/ J+ [5 d! x) R/ K5 e. P# ]
If you want to invest in energy, it would be best to invest into companies that produce these commodities, not the future of these actual commodities..