Valero Energy Corp., whose two big Corpus Christi refineries escaped damage, said it was working with federal and Texas agencies and its business partners to determine what infrastructure was needed to resume refinery operations. Even before Harvey hit, the prospect of supply disruptions sent gasoline futures to $1.74 a gallon, their highest level since April, before they retreated to around $1.67 by Friday afternoon. At the pump, experts see gasoline increasing 10 cents to 25 cents a gallon.