The Iran war has made oil tanker voyages so inefficient that vessel availability has crumbled and freight costs have soared to record-highs, all but erasing the incentive for shipping crude oil from the U.S. Gulf Coast to Asia. The cost of shipping crude oil from the U.S. Gulf Coast to China soared to as high as $80 million earlier this month. That’s ten times the average tanker rates that had held for years before t