The average retail gasoline price was 100 yen per liter as of May 10, up 2 yen from a month earlier, according to a survey released Thursday by the Oil Information Center.

The average hasn’t reached 100 yen since December, it said.

The increase is the biggest since October, when the price rose by 3 yen per liter.

The center said the increase reflects higher crude oil prices and a series of wholesale gasoline price increases by oil distributors.

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