Mealey's (May 6, 2022, 10:15 AM EDT) -- DENVER — The American Petroleum Institute (API) on May 4 filed a reply brief in the 10th Circuit U.S. Court of Appeals contending that the royalty valuation rule related to hydraulic fracturing production of oil and gas that was implemented by the U.S. Department of the Interior (DOI) in 2016 should be reversed because it “essentially seeks unfettered discretion” and the rule is “detached from decades of interpretation” of the governing statutes of federal royalty valuation....