US drivers hitting the roads this Memorial Day weekend can expect to find the lowest prices at the pump since 2009, federal data showed Friday. “On May 18, the US average retail price for gasoline was $2.74/gal, or 92 cents per gallon lower than at the same time last year,” the US Energy Information Administration said in a report published Friday. “This is the lowest average price heading into the Memorial Day weekend — the traditional start of the summer driving season — since 2009,” the report said. After a lag, pump prices began following global oil prices down last summer, reflecting a glut of oil followed by gasoline pressing on the market. Wholesale gasoline values hit bottom in December and began to rebound early this year, and this trend has also been seen in pump prices. This spring, gasoline values have been on the rise, reflecting recovered demand […]