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Woodall reckons a typical midsize fuel-cell-powered car would need to carry 115 pounds of alloy pellets and 50 pounds of water to go 350 miles. At today's economics, the alloy would cost $0.70/pound, or $80.50. (By recovering half the water coming out of the fuel cell, this system reportedly meets the Department of Energy's 6.0-percent hydrogen storage density target.) A midsize gasoline-powered car averaging 27 mpg needs 13 gallons (84.5 pounds, $39 at $3/gallon).