A gross understatement.
https://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=E...
Zoom in on this year and you'll see it's below $3 a gallon in January and February, then by the end of March it's over $4 and mostly above after that. That's a 33% increase. That's a substantial and sustained hike in a short time.
You must see the difference between us being unhappy that gas is more expensive, versus somebody living in Iran worrying that their entire government and country is in chaos.
Obviously this war is bad for a bunch of reasons, but the US is completely fine at home relatively.
With the exception of total wars, the domestic standard of living has very little to do with how well or not a foreign war is going.
How good Americans are living is a non-sequitur with regards to the war objectives set by the political and military leaders in Washington and Tehran. War, being politics by other means, has to be measured by political objectives. The average American didn't even notice when America relinquished control of Afghanistan to the Taliban, amd yet it was a clear-cut failure to achieve GW's stated goals.