By Jeff Cox, CNBC.com Staff Writer
NEW YORK (CNBC) -- A dollar plumbing three-year lows is hitting Americans squarely in the gas tank, and one economist thinks it could drive prices as high as $6 a gallon or more by summertime under the right conditions.With the greenback coming under increased pressure from Federal Reserve policies and investor appetite for more risk, there seems little direction but up for commodity prices, in particular energy and metals. Weakness in the U.S. currency feeds upward pressure on commodities, which are priced in dollars and thus come at a discount on the foreign markets. One result has been a surge higher in gasoline prices to nearly $4 a gallon before the summer driving season even starts, a trend that economists say will be aggravated as demand increases and the summer storm season threatens to disrupt oil supplies.
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