January RBOB prices were slightly higher during the early morning hours but some traders remained concerned over sluggish US gasoline demand readings. Yesterday's EIA data showed a much larger than expected build in gasoline stocks of 5.147 million barrels. The surprise build helped push current inventories to 1.03 million barrels above last year and 7.982 million above the five year average. Average total gasoline demand readings over the last four weeks was down 3.52% to year ago levels.