The One Big Beautiful Bill Act (OBBBA) is a proposed budget reconciliation bill that is making the news with such provisions as removing the tax on overtime, funding Trump's harmful deportations, increasing the SALT deduction, removing the tax on tips, or cutting Medicaid. There is another OBBBA provision that is making the news: CAFE standards.
In the OBBBA, the fines for the automobile fuel milage standards known as Corporate Average Fuel Economy (CAFE) standards are set to $0. This makes CAFE standards compliance voluntary while indirectly nullifying the standards without explicitly repealing CAFE standards. CAFE standards were part of the Energy Policy and Conservation Act of 1975. These standards were created in response to the 1973-74 oil embargo in order to reduce U.S. dependence on foreign oil. CAFE standards are currently set at 53.4 miles for passenger cars and 38.2 miles for light-duty trucks.
Over time, CAFE standards came to serve another purpose: reducing greenhouse gases (GHG). The idea behind CAFE standards is to incentivize cleaner and more efficient technologies, which were supposed to benefit consumers through lower fuel costs. So why am I happy CAFE standards will de facto no longer be in effect? In short, because it is an inefficient law with unintended consequences.
CAFE standards will not help save the planet. The National Highway Traffic Safety Administration (NHTSA) estimates that CAFE standards will reduce CO2 emissions by 605 million metric tons from 2026 to 2050. While that sounds like a lot of metric tons, the truth is that 605 million metric tons is the equivalent of six hours of global CO2 emissions in 2021. Given that there are 8,760 hours in a year, never mind a 25-year period, CAFE standards will do virtually nothing to reduce global carbon emissions.
CAFE standards have killed people. CAFE standards create an incentive to manufacture lighter vehicles because it is easier to achieve these standards with lighter vehicles. While lighter vehicles might be good for energy efficiency, they are less safe because the risk of vehicular death increases when a lighter vehicle collides with a truck or SUV, as opposed to a heavier vehicle in the same crash. For each 0.1 mile per gallon (MPG) increase in CAFE standards, there has been an increase of 150 deaths (Jacobsen, 2011). Other studies with more lenient standards have found that CAFE standards increase vehicle deaths (see Anderson and Auffhammer, 2013; National Academy of Sciences, 2002; Crandall and Graham, 1989). It would be an a fortiori assumption that stricter CAFE standards, combined with increased traffic, kill more people.
CAFE standards increase the price of new and used vehicles alike. As this study from the Mackinac Center shows, complying with CAFE standards entails a lighter vehicle weight, less acceleration, and technological upgrades, all of which are more expensive. A majority of those costs are passed on to the consumer, with an estimated cost of $24.1 billion of consumer costs in 2023 (Jacobsen, 2013).
We have to remember that CAFE standards do not apply to the individual vehicle, but rather an average across the entire fleet of a given manufacturer. Even so, the standards have become so high that they incentivize greater electric vehicle (EV) manufacturing than would otherwise exist. The average EV costs about $7,000 more than a traditional gas automobile, which means that CAFE standards are both incentivizing EV manufacturing and increasing automobile prices.
Not only that, used car owners are incentivized to hold onto their car longer, which constricts supply and drives up prices. In 2015 dollars, an increase of CAFE standards by 1 mile per gallon resulted a $164 increase in the average price of a large used car (Jacobson and van Benthem, 2015).
CAFE standards disproportionately harm the poor. 92 percent of U.S. households own a vehicle, which is to say that owning a vehicle is vital for the vast majority of Americans. This is significant since a car will cost a low-income household a higher percentage of household income than a high-income household. CAFE standards can very well make new vehicles out of reach for a low-income household, thereby driving them towards the used vehicle market and driving those prices up further. Additionally, energy efficiency standards are regressive because they require a high upfront cost. One study found that efficiency standards such as CAFE standards force low-income households to buy higher-cost vehicles, thereby being more regressive than an energy tax (Levinson, 2016).
Postscript. To recap, CAFE standards will do nothing of statistical significance to save the planet. All the while, CAFE standards kill people while driving up new and used automobile costs, especially for low-income households. These unintended consequences make the case even stronger for consumers to have the freedom to choose how to buy, drive, fuel, and insure their vehicles. Granted, the OBBBA's provision is not quite as good as simply repealing it because Democrats can always regain power and increase the fines for violating CAFE standards. But it is nice to have at least some reprieve from a regulations that is as much of environmental feel-good policy such as plastic bag bans, the Endangered Species Act, or the act of recycling plastic.
