Oil prices mixed on Saudi commitment to cut output, investor scepticism

By Henning Gloystein SINGAPORE (Reuters) - Oil prices were mixed on Tuesday, supported by Saudi Arabia saying it would adhere to a commitment to cut output, but held back by rising U.S. production and scepticism that OPEC as a whole would comply with its commitments to reduce supplies. Brent crude futures , the international benchmark for oil prices, were at $55.76 per barrel at 0813 GMT, down 10 cents from their last close. U.S. West Texas Intermediate (WTI) crude futures , however, were up 15