Brent prices are now the lowest they have been since late 2010, before violence in Libya and other areas in the Middle East and North Africa disrupted significant volumes of crude oil supply to the global market. However, that is not the only factor driving gasoline prices.Crude oil prices have moved up from the low $80s/barrel (bbl) to the mid-$80s/bbl mark, which is still down about $17 from last year. Meanwhile, gasoline prices have declined and last week's national average was $3.06, the lowest average price for any week since December 2010. Even with this increase in Brent crude, retail prices of gasoline in the U.S. are expected to drop below the magical $3.00/gallon level in the coming weeks.The spot price for North Sea Brent crude o...