The 1973 Oil Embargo and the Fuel Economy Rules It Produced

In October 1973, with war raging between Israel and its neighbors Egypt and Syria, the Arab members of the oil producers' cartel announced that they would cut production and halt oil shipments to the United States and several other countries that had backed Israel. Within weeks the price of crude had shot up, and by the winter Americans were learning a new ritual. They sat in lines of cars that wrapped around the block, engines idling, waiting for a station that might run dry before they reached the pump. Some states rationed fuel by license plate, letting cars with odd-numbered plates buy on odd-numbered days and even-numbered plates on even days. The embargo lasted about five months. The law it inspired, and the rules that law created for every new car sold in the country, are still with us, though in 2025 Congress quietly took away their teeth.

In short: The 1973 oil embargo exposed how dependent the United States was on imported oil and led Congress to pass the Energy Policy and Conservation Act in 1975, which created the first federal fuel economy standards. Those rules nearly doubled the efficiency of new cars within a decade, then stalled for a generation, with a loophole for light trucks that helped build the SUV era. The history shows both how much efficiency standards can do and how easily they can be frozen or hollowed out.

A country running on cheap oil

To understand why the embargo hit so hard, you have to picture the American car of 1973. It was big, heavy and thirsty, often with a V-8 engine under a long hood. Gasoline had been cheap for so long that few buyers thought much about mileage. The country's own oil production had peaked around 1970 and begun to decline, and imports had been growing fast to fill the gap.

The embargo was a political weapon. The United States had organized an emergency airlift of weapons to Israel during the October war, and the Arab producers responded by targeting the country's most obvious vulnerability. The cuts were not enormous as a share of world supply, but the oil market had little spare capacity, and panic did the rest. The price of a barrel roughly quadrupled over a few months.

The response in Washington was a scramble. President Richard Nixon announced what he called Project Independence, a goal of making the country self-sufficient in energy by 1980. It was never achieved, and later presidents set similar goals with similar results. Congress approved the Trans-Alaska Pipeline in November 1973 after years of fighting over it. A national speed limit of 55 miles per hour followed early in 1974, on the theory that cars burn less fuel at lower speeds. The country even tried year-round daylight saving time that winter, an experiment that became unpopular quickly as schoolchildren waited for buses in the dark and was abandoned within a year.

The embargo was lifted in March 1974. Prices did not go back to where they had been.

The law Gerald Ford signed

By the time Congress produced its major energy law, Nixon had resigned and Gerald Ford was in the White House. The Energy Policy and Conservation Act, signed in December 1975, did several things at once. It created the Strategic Petroleum Reserve, the government stockpile of crude oil held in salt caverns along the Gulf Coast that exists to cushion the country against supply shocks. It set energy efficiency rules for appliances. And it established Corporate Average Fuel Economy standards, known ever since by their initials, CAFE.

The idea behind CAFE was clever in its way. Rather than set a mileage limit for every individual car, the law required each manufacturer's fleet of new cars to meet an average. A company could sell some gas guzzlers as long as it sold enough efficient cars to balance them out. The standard for passenger cars started at 18 miles per gallon for model year 1978 and rose to 27.5 miles per gallon by 1985, roughly double the average of the cars on the road when the embargo hit.

The Department of Transportation, through what became the National Highway Traffic Safety Administration, was put in charge of setting and enforcing the standards. The EPA was given the job of measuring mileage. Companies that missed their targets paid civil penalties based on how far short they fell and how many cars they sold.

Automakers fought the standards and warned that meeting them would be impossible or would force everyone into tiny, unsafe cars. Then they met them. Engineers shrank cars, shed weight, adopted front-wheel drive, improved engines and moved toward fuel injection. Japanese companies, already building smaller cars, gained market share. The American fleet got dramatically more efficient within a decade.

The second shock and the panels on the roof

The country got a second lesson before the first one had fully sunk in. In 1979 the revolution in Iran disrupted that country's oil exports, prices spiked again, and the gas lines came back, this time with odd-even rationing in several large states and tempers flaring at the pumps. President Jimmy Carter, who had already called the energy crisis the moral equivalent of war, gave a televised address that summer about a crisis of confidence in the country. The speech is remembered, unfairly or not, as a political misstep.

Carter also had solar water-heating panels installed on the roof of the White House West Wing in 1979, a small gesture meant to show where he thought the country should go. During a roof repair in the Reagan years, the panels came down and were not put back. Oil prices fell sharply in the mid-1980s, federal support for renewable energy research shrank, and the sense that the country needed to change how it used energy faded with the gas lines.

It is a small story, but it captures a pattern that repeats through the whole history of American energy policy. Crisis produces action; cheap fuel produces forgetting. The fuel economy rules were the part of the 1970s response that survived, mostly because they were already written into law and kept working quietly in the background.

The light truck loophole

The 1975 law set separate, lower standards for what it called light trucks, a category meant for pickups and work vehicles used by farmers and tradespeople. That seemed reasonable at the time. It turned out to be one of the most consequential decisions in the history of American transportation.

Automakers discovered that vehicles built on truck frames and classified as light trucks faced easier mileage rules and, as it happened, other regulatory advantages as well. Minivans and then sport utility vehicles were designed to fit the truck category. SUVs were profitable, popular, and counted against a softer standard. Through the 1990s and early 2000s, the share of new vehicles sold as light trucks climbed steadily until trucks, SUVs and vans made up a majority of new vehicle sales.

Meanwhile the standards themselves stopped moving. The passenger car standard was briefly lowered in the mid-1980s under the Reagan administration and restored to 27.5 by 1990. Then it stayed at 27.5 for about two decades. Congress fought repeatedly over raising it and repeatedly failed, with automakers and the United Auto Workers often lobbying together against increases they feared would cost jobs. Oil prices had collapsed in the mid-1980s, and the sense of crisis had faded. As the fleet shifted toward trucks, the average fuel economy of new vehicles actually drifted downward for a stretch.

There is a fair point on the other side of this story. Some economists have long argued that fuel economy standards are a clumsy tool. They push automakers to build efficient cars without giving drivers any reason to drive less, and better mileage makes each mile cheaper, which can lead people to drive more. A gasoline tax, by contrast, rewards both buying efficient cars and driving less. That critique is correct as economics. It runs into the same wall as every carbon-pricing proposal: Americans hate gas taxes, and Congress has not raised the federal gas tax since 1993. Standards survived because they were politically possible. The costs were hidden in the price of new cars rather than displayed at every fill-up.

Waking the standards back up

The long freeze ended in 2007. President George W. Bush signed the Energy Independence and Security Act, which directed regulators to raise the combined standard for cars and light trucks to at least 35 miles per gallon by 2020. That law passed with bipartisan support at a time when gas prices had climbed again and concerns about imported oil were rising.

Two years later, with the auto industry on the edge of collapse and dependent on federal rescue loans, the Obama administration brokered an agreement with automakers, the state of California and the union. The EPA would set greenhouse gas standards for vehicles under the Clean Air Act, the Transportation Department would set matching fuel economy standards, and California, which has special authority under the Clean Air Act to set its own vehicle emissions rules, would align its standards with the national ones. The industry got one national program instead of a patchwork. In 2012 the agencies set standards running through 2025 that were meant to roughly double fuel economy again.

Those rules then became a political football. The first Trump administration weakened them; the Biden administration tightened them again, and paired them with tougher EPA tailpipe rules. In 2025 the pendulum swung back hard. Congress used the Congressional Review Act to revoke California's permission to require that a rising share of new cars be zero-emission. And the 2025 budget law set the civil penalty for missing the fuel economy standards to zero. The standards remained on the books, but a rule with no consequence for breaking it is a suggestion. The administration also moved to roll back the standards themselves.

What the embargo still teaches

Half a century later, the embargo's lessons are mixed, and progressives should take all of them seriously.

The first lesson is that efficiency standards work when they are enforced and rising. The first decade of CAFE saved enormous amounts of oil, and the cars that came out of it were not the death traps automakers predicted. Every gallon Americans did not need to buy was a gallon no oil cartel could withhold and no refinery could pollute.

The second is that standards decay without pressure. When gas was cheap and the crisis faded, the rules froze and the industry found the gaps. The truck loophole did not happen by accident; it was the predictable result of a rule that treated two kinds of vehicles differently when buyers could easily switch between them. A rule designed in a crisis needs a way to keep tightening after the crisis passes. The 2007 law tried to fix part of this by tying standards to a vehicle's size, so that a large truck and a compact car each face a target suited to their footprint. That closed some gaps and opened others, since bigger vehicles get easier targets, and automakers have kept making their vehicles bigger.

The third lesson is about who pays. The embargo landed hardest on people who had to drive to work, who could not afford a new car, and who lived far from transit. Rural families, many of whom need trucks for real work, are still the ones most exposed to swings in fuel prices. A climate policy that does not take those families seriously, by helping them afford cleaner vehicles and by keeping fuel costs predictable, will not keep their support. That is as true in 2026 as it was in the gas lines of 1974.

And the last lesson is about the oil itself. The country that waited in those lines decided it never wanted to depend on someone else's oil again. The United States is now the world's largest oil producer, a fact that politicians of both parties celebrate. But oil is priced on a world market, and a war in the Persian Gulf still moves the price at a gas station in Ohio. The only real protection from that, as the embargo generation first suspected, is needing less of it. You can follow the industry's side of this fight on the big oil and fossil fuels page.

What you can do

Vehicle rules are written by federal agencies and decided in Congress, which leaves openings for anyone willing to use them.

• Comment when the rollbacks are proposed. Changes to fuel economy and vehicle emissions standards must go through a public comment period. The federal comment page lists rules open for comment, closing soonest first, grouped by issue, with advice on what makes a comment count.
• Ask your representatives about the penalties. Restoring consequences for missing fuel economy standards takes an act of Congress. Find your members, call their offices and ask whether they will support it.
• Watch the trend lines. The climate data page shows the US power mix and clean power by state, which matters more and more as cars shift from gasoline to the grid.
• Help with the cost side. Local groups working on transit, energy assistance and affordable transportation are listed in the organizations directory, by cause and state.

The people sitting in those gas lines in the winter of 1973 did not think of themselves as climate activists. They wanted to get to work without wasting a morning. The law they got saved more oil than any other single policy of its time. Keeping it alive means remembering why they wanted it.