Another Utah refinery says it will launch effort to make cleaner ‘Tier 3’ fuel

HollyFrontier — one of the two remaining Utah refineries that has yet to produce low-sulfur “Tier 3” gasoline — announced Thursday that it is beginning upgrades that should allow its Wood Cross refinery to produce the cleaner fuel in about six months.“By moving to Tier 3 fuels, we are advancing our commitment to deliver high-quality fuel products in an environmentally responsible way,” said Scott White, vice president and manager at the Woods Cross refinery.He