The Reserve Bank has cautioned it remains too early to tell what the economic impact of the war in Iran will be, even as surging petrol prices deliver another hit to inflation-weary households.Speaking at the Australian Financial Review's Business Summit in Sydney this morning, RBA Governor Michele Bullock was characteristically guarded when addressing the outbreak of conflict in the Middle East over the weekend.She said while a disruption of oil and gas supplies could send Australia's already-high inflation further in