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Gasoline Standards

Volatility Regulations for Gasoline and Alcohol Blends

Rule Summary

EPA established a two-phase reduction in summertime commercial gasoline volatility. These rules reduce gasoline emissions of volatile organic compounds (VOC) that are a major contributor to ground-level ozone (smog). Phase I was applicable to calendar years 1989 through 1991. Depending on the state and month, gasoline RVP was not to exceed 10.5 psi, 9.5 psi, or 9.0 psi. Phase II is applicable to 1992 and later calendar years. Depending on the state and month, gasoline RVP may not exceed 9.0 psi or 7.8 psi.  EPA provides a 1.0 psi RVP allowance for gasoline containing ethanol at 9 to 10 volume percent.

Additional Resources

  • Final Rule: Volatility Regulations for Gasoline and Alcohol Blends Sold in Calendar Years 1992 and Beyond. 55 FR 23658, June 11, 1990 (electronic version not available).
  • Final Rule: Volatility Regulations for Gasoline and Alcohol Blends Sold in Calendar Years 1989 and Beyond. 54 FR 11868, March 22, 1989 (electronic version not available).