Gasoline refined to a government standard called Tier 3 holds promise for significant improvements in air quality for the Wasatch Front region. Local refineries, which supply almost all the gasoline used in Utah, are under a mandate to bring it to the market by 2020. State government is urging them to do it sooner and even offering large tax credits to help get the job done sooner. But one Utah refinery says the gasoline shipments … Continued