Oil prices eased on Monday after rising two per cent in the previous session, as investors focused on short-term demand concerns stemming from crucial upcoming US inflation data and refinery maintenance in Asia and the United States. Brent crude futures fell 74 cents, or 0.9pc, to $85.65 a barrel by 0400 GMT after a 2.2pc gain on Friday. US West Texas Intermediate crude was at $78.99 a barrel,