Top American companies from GM to Coca-Cola are trying to reassure investors they can weather the financial fallout from the Iran war, even as surging fuel and packaging costs threaten margins. Oil prices have jumped since the start of the conflict, driving up input costs across industries already pressured by U.S. tariffs. The increase is forcing companies to weigh price increases at a time when consumers are showing signs of strain. A Reuters review of company statements since the start of the war showed that 24 companies have withdrawn or cut their forecasts, 35 have signaled price hikes and another 35 have warned of a financial hit.