Oil and products prices are buoyed by a tightening U.S. gasoline market. The lowest level of gasoline stocks in almost 16 years sent Nymex unleaded futures for May delivery to 74.18/gal Apr. 17--up almost 20 in a day and 80 in 2 weeks and the highest since Jan. 17--the day after Operation Desert Storm commenced. Nymex crude for May delivery closed Apr. 17 at $21.71/bbl, a rise of almost $2.50 since Apr. 1.