* Colonial seeks FERC permission to change grades in pipeline * Gasoline shippers oppose changes, say pump prices will rise * Pipeline is most efficient way to ship fuel to US East Coast * Colonial says changes will boost capacity on main gasoline line By Shariq Khan and Nicole Jao NEW YORK, March 10 (Reuters) - At least four U.S....

NEW YORK (Reuters) - At least four U.S. gasoline marketers are preparing legal and regulatory challenges to the Colonial Pipeline over proposed changes in fuel shipping terms which the companies say will hurt their margins and drive up fuel prices at the pump, sources familiar with the discussions said. The Colonial Pipeline is a key artery for shipping fuel from...

March 10 (Reuters) - Canadian oil producer Frontera Energy ( FECCF ) said on Monday that it believes its license to explore the Corentyne block off the coast of Guyana remains valid and it is assessing all legal options to assert its rights. The Guyanese government gave Frontera and CGX Energy ( CGXEF ) , the joint operators that hold...

HOUSTON/SINGAPORE (Reuters) - Several U.S. LNG producers are trying to renegotiate higher prices with buyers as a result of rising construction, labor and borrowing costs, according to sources and company statements reviewed by Reuters. Higher prices would eat into the competitive advantage of U.S. liquefied natural gas on the global market, at a time U.S. President Donald Trump is seeking...