U.S. crude futures inched up in early Asian trading on Friday but remained near three-month lows after a persistent supply glut has cut prices by nearly 13 percent since the start of November. U.S. crude’s West Texas Intermediate (WTI) futures were quoted 5 cents higher at $40.59 a barrel as of 0024 GMT. Crude futures have already lost around 60 percent of their value since mid-2014 as supply exceeds demand by roughly 0.7 million to 2.5 million barrels per day to create a glut that analysts say will last well into 2016.