The broad claim that Americans have been paying much more for gasoline since late February is well supported by AAA and EIA. AAA's March 26 article states the national average rose from $2.98 on February 26 to $3.98 on March 26, and AAA's April 2 article says the national average exceeded $4 per gallon, reaching $4.081. EIA weekly data independently supports the late-February baseline at $2.937 for the week ending 2026-02-23. These sources substantiate the post's directional premise that average U.S. gas prices rose sharply after the Iran conflict began. However, the exact figures of '$8.4 billion more' and '$240 million more per day' were only found in the secondary Benzinga article, not in a primary calculation source fetched during this run. So the statement is likely true in substance, but the precise dollar totals are not fully verified from primary-source evidence here.