Reuters: Sunoco Inc (SUN.N) Chairman and Chief Executive Lynn Elsenhans on Tuesday called on U.S. refiners to support a “sizable” increase in the federal gasoline tax to pay for investments in the national infrastructure. “We should support a sizable increase in the federal gasoline tax for the express purpose of funding much needed infrastructure investment,” Elsenhans said in a speech to the National Petrochemical & Refiners Association annual meeting in San Antonio. Elsenshans …