Surging gas prices have hit American drivers hard — but some much harder than others. For households in the bottom quarter of the income distribution — those earning roughly $40,000 a year or less — commuting fuel costs now consume an average of about 4 percent of their income, according to a Washington Post analysis. For households in the top quarter, earning $100,000 or more, the same costs amount to less than 1 percent. The gap has widened since March, as the U.S. war on Iran escalated and oil shipments through the Strait of Hormuz stalled, with implications for global...