San Francisco becomes first US city where diesel prices top $8 a gallon

Diesel prices in San Francisco have climbed past $8 per gallon, marking a new high even for a state already known for some of the most expensive fuel in the country. The spike comes as the ongoing conflict with Iran drives global oil prices upward, highlighting the instability of fuel markets. In California, additional factors—including tougher environmental regulations, higher fuel taxes and limited refinery capacity—often push prices far above the national average.

The Bay Area has historically faced some of the highest fuel costs in the United States, but diesel crossing the $8 mark sets a new record for the region. Diesel fuel is a critical part of the nation’s economy because it powers freight transportation, shipping operations and many public transit systems. Because of that, diesel prices are particularly vulnerable to refinery limitations and disruptions in global oil supplies.

The impact of rising diesel prices is expected to extend beyond California. When diesel becomes more expensive, transportation and shipping costs usually increase as well. Those higher costs often make their way into the prices consumers pay for goods and services across the country.

Gasoline prices are also increasing in most parts of the United States, with several states already seeing prices well above the national average.

According to AAA, the nationwide average price for regular gasoline reached $4.11 per gallon as of April 5. That figure represents an increase of 86 cents compared with a month earlier. Drivers on the West Coast are paying the most, with average prices hitting $5.92 per gallon in California and $5.37 in Washington state.

On the East Coast, several areas have already crossed the $4 mark. Gasoline averages $4.27 per gallon in Washington, D.C., and $4.06 in New York. In the Midwest, Illinois stands out with an average price of $4.29 per gallon, while many other states in the region remain in the mid-$3 range.

Fuel costs are generally lower in the South, though prices are climbing there as well. Texas currently averages about $3.82 per gallon, the same as South Carolina, while Florida drivers are paying closer to $4.20.

Amid the tensions, President Donald Trump issued a strongly worded message to Iran on Sunday. He warned that the United States would strike Iranian power plants and bridges this week if the Strait of Hormuz is not reopened.

The Strait of Hormuz, located between Iran, the United Arab Emirates and Oman, is one of the world’s most important shipping routes for energy supplies. In his message, Trump said that Tuesday would be “Power Plant Day and Bridge Day” in Iran if the waterway remained blocked. He also demanded that Iranian leaders reopen the strait immediately, warning of severe consequences if they did not.

Even though fuel prices could shift in the weeks ahead, the current surge demonstrates how quickly energy costs can rise when global supply routes are threatened. It also shows how fragile fuel markets remain when geopolitical tensions disrupt the flow of oil.