i would stay away from energy mutual funds.
IMO the time to get into them was last year around this time - when they were jsut starting to get bullish. Now they've been at record highs - and you could bet that they'll keep going higher, but a safer bet to me, is that they've got a long way to fall, at this point.
Perhaps rather than a mututal fund with all it's expenses and commisions, how about an Exchange Traded Fund that is in the energy sector, if you're hell-bent on riding out what's left of this bull? that way you can get a better idea of what it's doing on a day to day basis, and liquidate it a little quicker if it's not to your liking.
Finally - I ran across this ETF just yesterday that I am keeping my eye on - it's actually an Alternative Fuel ETF that's been going gangbusters since inception (May 2005) but especially after Katrina. That may be "false profits" that we're seeing tho. In any case, i'm watching it, and intend to make a play in a couple of weeks. It's called Powershares Wilderhill Clean Energy Portfolio (PBW). Here's the yahoo details on it:
http://finance.yahoo.com/q?s=PBW&d=t