There’s a number attached to the coming fuel-economy rollback, and depending on which government document you open, it’s $900, $925, or $1,000. All three describe the same modeled figure. Only one of them appears in the actual arithmetic.
Open Table 1-2 of NHTSA’s Preliminary Regulatory Impact Analysis for SAFE Vehicles Rule III and the per-vehicle number is $925. Not next year. In model year 2031, and only if manufacturers hand the savings to buyers rather than to shareholders or employees. The agency writes that condition into the document itself. Total industry technology savings through MY 2031 come to $11 billion; divide it across MY 2031 production and you get $925. The preamble rounds that to approximately $900. DOT’s public fact sheet rounds it up to $1,000 per vehicle.
Worth knowing what you’re actually being promised: not a discount on the truck you’re shopping for this weekend, but a modeled reduction in the technology bill of materials on a vehicle five model years out, assuming full pass-through in an industry that has spent the last four years demonstrating it will hold price when it can.
What the rule actually does to the mpg number
The proposed standards raise stringency 0.5% per year through MY 2026, then 0.25% per year through MY 2031, with MY 2027 acting as a bridge. NHTSA projects a fleetwide light-duty requirement of roughly 34.5 mpg in MY 2031, against the 50.4 mpg trajectory in the 2024 rule it replaces.
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Neither figure is a window sticker. CAFE compliance is measured on the two-cycle test, and NHTSA states plainly in a footnote that real-world fuel economy is generally 20 to 30 percent lower than the CAFE level. Run the conversion: 34.5 mpg CAFE lands somewhere around 24 to 28 mpg in the real world. The 50.4 mpg target it replaces works out to roughly 35 to 40. That’s the honest translation, and it’s smaller than the headline gap suggests.
The over-compliance problem nobody’s talking about
Here’s the part that undercuts the whole affordability pitch. NHTSA’s Table I-2 projects both the required and the achieved fleet average. Under the preferred alternative, the light-duty fleet is required to hit 34.5 mpg in MY 2031 and is projected to actually achieve 41.3 mpg.
The standard is non-binding by nearly seven miles per gallon. Manufacturers are modeled as blowing past it because they already bought the tooling, and because buyers pay for efficiency on their own. The agency spends several pages of the PRIA arguing exactly that, citing research suggesting new-car buyers value at least half, and perhaps much more, of the lifetime fuel savings a higher-mpg model offers. If that’s true, and if the fleet over-complies anyway, then the $925 is money saved on technology the market was pricing in regardless.
Penalties have already been zero since MY 2022
The enforcement question was settled before this rulemaking started. Section 40006 of the One Big Beautiful Bill Act set CAFE civil penalties to $0 beginning with model year 2022. NHTSA acknowledges the consequence in the PRIA: because the current civil penalty rate is set to $0, there are no monetized effects from changing CAFE compliance positions for model years already built.
Read that again. Retroactively rewriting MY 2022–2026 standards changes nothing for anyone, because the fine for missing them is already nothing. The compliance math matters only as a baseline for the years going forward.
Why your crossover has all-wheel drive it doesn’t need
The most consequential piece of this rule for enthusiasts isn’t the mpg curve. It’s the MY 2028 fleet reclassification, and the reasoning behind it is the best explanation of modern crossover design I’ve read in a federal document.
NHTSA notes that 68 percent of the light-duty fleet currently meets the light-truck definition, while most of those vehicles — AWD crossovers, three-row vehicles, and vehicles without an approach angle sufficient to clear an off-highway obstacle — cannot realistically operate off road or carry meaningful cargo. They’re built to the definition, not to a use case.
The agency then names the receipt. After NHTSA reclassified over a million front-wheel-drive automobiles as passenger cars in 2009, manufacturers discontinued FWD versions of vehicles and built only AWD or 4WD versions to keep those products in the light-truck fleet. It also flags automakers bolting on aerodynamic hardware rather than meeting an approach-angle requirement that would have made the vehicle genuinely more capable.
So: the AWD-only compact crossover with 7.9 inches of ground clearance and a plastic front air dam that scrapes on a steep driveway is a regulatory artifact. The proposal would push those vehicles into the passenger-car fleet starting in MY 2028, which mechanically drops the measured average of both fleets even if the combined number holds steady. NHTSA says so directly.
Credit trading dies in 2028
The proposal also ends inter-manufacturer credit trading beginning MY 2028, with NHTSA describing the current system as having resulted in a windfall for EV-exclusive manufacturers that sell credits to other non-EV manufacturers. Within-company transfers survive, capped at 2 mpg, along with five-year carry-forward and three-year carry-back. If you’ve wondered why a company selling nothing but EVs posted regulatory-credit revenue as a profit line, this is the plumbing being removed.
The wallet math, done properly
A $925 MSRP reduction isn’t a $925 savings. NHTSA understands this better than most press releases do, noting that finance charges, taxes, insurance costs, and registration fees almost always increase along with the selling price of a new vehicle. It runs in reverse too.
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Work it through on a typical deal. Knock $925 off the price, add roughly 7% sales tax, and you’re financing about $990 less. At a 72-month term — which NHTSA notes became the most common new-vehicle contract length between 2008 and 2023, up from 60 months, with 84-month deals increasingly common — and around 7.5% APR, you avoid roughly $240 in interest. Call it $1,230 in total outlay, plus whatever it saves in an ad valorem registration state and a marginally lower insured value.
That’s real. It’s also arriving in 2031, against a backdrop NHTSA describes with unusual candor: average new-vehicle selling prices rose nearly 50 percent between 2012 and 2024 and now approach $50,000, more than double the increase in household income, while the average vehicle age climbed from 10.6 to 12.6 years. Nine hundred dollars against a $50,000 average is 1.8%. It’s a rounding error on a dealer’s four-square.
What you give up
NHTSA’s own accounting says gasoline consumption rises about 3.7% through calendar year 2050 relative to the current standards. The agency reaches net benefits of $102.8 billion by zeroing out the social cost of carbon and non-criteria emissions in its primary analysis, then monetizing those effects only in sensitivity cases. Whether you consider that a correction or a thumb on the scale is a policy argument, but it’s the reason the ledger balances the way it does.
Two practical notes for buyers. First, nothing here changes a vehicle you can order today; the comment record closed February 4, 2026, and SAFE III is still listed as a proposal. Second, when a final rule does land, expect litigation — EPCA’s “maximum feasible” language has been the hook for every CAFE challenge since 1975, and a rule that retroactively rewrites completed model years is a fat target. Product plans run five to seven years. The next election is in 2028. Do the math on how stable this is.