BP Australia managing director Greg Bourne warned yesterday against any backsliding in moving toward cleaner fuel standards..."It is too easy for people to settle on the lowest common denominator and to go up to a high standard requires leadership by the governments, the car industries and the oil industries," he said. BP...has invested heavily in its Perth and Bulwer Island refineries to produce cleaner fuels, moving ahead of its competitors in Australia to meet new federal fuel standards being phased in to 2006.