Andeavor recently said much of the cash from tax cuts would go back to investors. Above, the company’s refinery in North Dakota. U.S. fuel makers are poised to reap billions under a sweeping Republican overhaul of the tax code. But don’t expect them to expand, go on a hiring binge, or lower prices at the pump. Refiners haven’t built any major new plants in the U.S. since the 1970s. Instead, they have been returning profits to shareholders en masse in recent years, because the country has more gasoline and diesel than it can consume. That strategy is expected to continue if refiners, who have largely been paying the current 35% corporate tax rate, see their rate drop to 21% under the proposed tax cut, according to analysts and people familiar with the companies’ plans. The brunt of the savings—an extra $1.5 billion next year alone—likely would wind up benefiting […]