It's not as simple as "we don't get oil from Iran". Iran and Chavez can easily cause a world-wide shortage which will increase prices including prices from places we do get oil from. Likewise Iran and Mini-Me can blockade the Straits causing further shortages. Yup we have the SPR which when dipped into must be replaced at market prices and we should know by now that wars often last longer than anticipated.
Agreed. It won't be a 'cake-walk,' but survivable.
If we go to war with Iran, Russia has threatened to cut off oil to the eastern EU and the US.