China’s move to end its currency’s peg to the dollar initially fanned enthusiasm for crude, since a stronger yuan will make dollar-based commodities such as oil cheaper in China and bolster demand, but oil prices gave up earlier gains Monday afternoon as uncertainty set in about how quickly China may implement currency changes trimmed oil prices.

Crude gained 64 cents, to settle at $77.82 a barrel, on the New York Mercantile Exchange after rising as high as $78.92.

Retail prices for gasoline in the United States have climbed over the last week and are headed back toward a national average of $2.80 to $2.90 per gallon with higher prices on the West Coast, said Tom Kloza of the Oil Price Information Service. Get the full story »