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The V12 Gets a Reprieve: What Looser Fuel Rules Mean for Naturally Aspirated Values

The U.S. just changed the regulatory math for big-engine supercars. Much of the pressure that pushed automakers to hybridize everything from V8s to V12s is easing.

Oct 13, 2026 · 2 min read

The U.S. just changed the regulatory math for big-engine supercars. NHTSA's SAFE III final rule, issued Sept 28, 2026 (published Sept 30 at 91 FR 61988) and effective Nov 30, 2026, lowers the projected 2031 fleet fuel economy target from roughly 49–50 mpg under the previous rule to about 35 mpg. Much of the pressure that pushed automakers to hybridize everything from V8s to V12s is easing.

Europe is moving more slowly, but in the same direction. On Dec 16, 2025, the European Commission proposed cutting the 2035 CO2 target for new cars from a 100% reduction to 90%, leaving room for some combustion engines, plug-in hybrids and range extenders after 2035. It's still a proposal; Parliament is expected to vote around Nov 23, 2026, so 'reconsidering' is the accurate word, not 'repealed.'

The numbers

  • 2031 U.S. fleet target, previous rule: about 49.3 mpg projected (final rule, 91 FR 61988; NHTSA's 2024 release put it at about 50.4 mpg (NHTSA, 2024))
  • 2031 U.S. fleet target, SAFE III: about 34.9 mpg projected (91 FR 61988)
  • SAFE III effective date: Nov 30, 2026 (Federal Register)
  • EU 2035 CO2 target for new cars: 100% reduction cut to 90% (proposed Dec 16, 2025, COM(2025) 995)
  • European Parliament plenary vote: expected Nov 23, 2026 (Legislative Train Schedule); a committee vote set for Oct 5, 2026 was postponed, so the date could move

For collectors, the question is whether naturally aspirated V12s and V10s are still a closing chapter. Cars like the Aventador SVJ, Huracán STO and 812 Competizione have carried a 'last of its kind' premium because buyers assumed rules would end engines like theirs. Looser targets soften that story at the margin, but they don't rebuild supply: Lamborghini, Ferrari and others have already committed to hybrid V12 and V8 platforms, and today's limited-run naturally aspirated cars stay rare.

Our view: top-spec, low-mileage examples should hold their premium, while ordinary and high-mileage cars may see some scarcity hype come out of prices.

Watch item: if the EU vote passes and brands announce new non-hybrid V12 programs, the last-of-a-breed premium is the first thing at risk.

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Sources

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