Traveling by car these days will cost you more this summer-- at least $1.70 a gallon for gas. That's the average price at the pump this month, up 13 percent from just a year ago. An estimated 30 million drivers will hit the road for Memorial Day weekend. If each one buys just a gallon of gas, they'll have spent about 51 million bucks. Who sets the price? If you think gas prices are high in the U.S., take a look at Europe. There, gas is typically four times as expensive. The going price...
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