Six weeks into the conflict with Iran, the closure of the Strait of Hormuz has choked off roughly 20 percent of the world’s oil supply, with prices surging, at times, beyond $100 a barrel. U.S. gasoline now averages near $4 a gallon in many areas, and the ripple effects are already showing up in higher operating costs for small businesses across the country.  Although domestic U.S. oil production is benefiting from the higher global prices and allowing for increased exports, oil is priced on