The U.S. Environmental Protection Agency (EPA) has renewed for a second time an emergency waiver for the summer spec gasoline requirements in four Midwest states following the supply emergency after the shutdown of ExxonMobil’s Joliet refinery in Illinois in July and early August. The waiver for Illinois, Indiana, Michigan, and Wisconsin lifts the federal anti-smog rules that require more expensive summer gasoline to be sold in the U.S. during the hottest months of the year. The waiver, first issued on July 31 after ExxonMobil’s Joliet…