Crude oil prices also fell more than $4 a barrel on Monday after President Trump announced an Iran deal. NEW YORK, June 15 (Reuters) - U.S. average retail gasoline prices dipped below $4 a gallon for the first time since mid-April, as optimism grew that a preliminary deal between the U.S. and Iran would lead to the reopening of the Strait of Hormuz, a critical passageway for global oil supplies. Prices for crude oil fell more than $4 a barrel on Monday after U.S. President Donald Trump

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