Fuel Quality

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​​In addition to monitoring accuracies at Wisconsin stores, Weights and Measures inspectors are also responsible for test​ing fuel quality and pump safety at stations statewide.

​Guidance Docu​ments

New! DATCP acknowledges EPA final rulemaking on gasoline ethanol blends effective April 29, 2025. The US Environmental Protection Agency (​EPA) issued a final rule on February 29, 2024, regarding 40 CFR Part 1090, Regulation of Fuels, Fuel Additives, and Regulated Blendstocks. Effective April 29, 2025, summer gasoline-ethanol blended fuels containing between 9 and 15 percent ethanol, retailed in Wisconsin within EPA Clean Air Act (CAA) attainment areas will have a Reid vapor pressure (RVP) limit of 9.0 psi. The retail summertime fuel regulation period is between June 1 and September 15. The EPA final rule can be found here. A press release announcing the EPA will uphold the effective date can be found here.​​

Gasoline-Ethanol ​Blends Minimum Temperature: On October 4, 2024, DATCP issued a guidance document specifying enforcement discretion for fuel supply chain stakeholders at the minimum temperature for 50% evaporation for gasoline-ethanol blended fuels.​​​

Emergency RVP Waiver: On August 1, 2024, the U.S. Environmental Protection Agency (EPA) issued a waiver related to Reid Vapor Pressure (RVP) requirements to a​ddress a fuel supply eme​rgency. On August 28, the waiver was extended until September 15, 2024​. Learn​ more.​

  • ​​On August 1, DATCP posted a guidance document related to the first emergency EPA waiver.
  • On August 14, DATCP updated the guidance document​ to reflect the extension of the emergency EPA waiver.

RVP Waiver: ​On April 19, 2024, the U.S. Environm​ental Protection Agency (EPA) issued a waiver related to Reid Vapor Pressure (RVP) requirements. Learn more.

​​Rac​e Gasoline: On March 7, 2024​, DATCP issued guidance that under certain con​ditions, sellers of race gasoline may use half-gallon unit pricing through December 31, 2024.

Race Gas Variances

Valor Oil Renegade 110 Race Gas Variance

Smith Oil Sunoco Standard Race Gas Variance

VP Racing Fuels VP110 Race Gas Variance