DBE tracks an Index of energy futures long positions. There is a high risk of an oil price collapse if Iranian oil is released on the market, and DBE would suffer greatly in that event.
The United States Gasoline ETF (UGA) offers investors an equity exposure to gasoline prices. Check out what is my algorithmic trading strategy on UGA ETF.
ALPS Alerian MLP ETF is a money-loser in the long haul. It charges a very high expense ratio despite being a passive index strategy. Read more about AMLP here.