** FILE ** Cars line up for gas at a gas station in Martinez, Calif. in this Sept. 21, 1973 file photo. The economic slowdown of today might better be compared with the downturn that gripped the United States in the early 1970s, a time now widely remembered for long lines at the pump. Today gas is plentiful, but summer drivers face the scary prospect of paying $4 a gallon. (AP Photo)