Can ETFs ease pain at the pump? 

BOSTON (MarketWatch) -- Families who pack up the car this Fourth of July weekend will spend much less on gasoline than last year -- prices are down by more than a third from last summer. But when it comes to fueling your investment portfolio, a specialized exchange-traded fund may hedge against unwelcome oil-price spikes.

United States Gasoline Fund (UGA 30.76, -0.01, -0.03%)  is designed to track the movement of gas prices, but investors should be aware of its caveats and risks.

Energy prices collapsed in 2008 after peaking last summer, and demand for gas and oil is expected to stay weak as a result of the global economic downturn...

Click here to read more about the new gasoline ETF.

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