Evaluation Program for Aftermarket Retrofit Devices
EPA does not approve, certify, endorse, or register any products that pass through this voluntary evaluation program. Neither does EPA approve, certify, endorse, or register any independent laboratory or the test results from any independent laboratory. Any claims by a manufacturer to the contrary are false.
EPA conducts a voluntary program to evaluate aftermarket devices and fuel additives that manufacturers claim will improve fuel economy and/or reduce exhaust emissions for passenger cars and trucks. The purpose of the Aftermarket Retrofit Device Evaluation Program (also known as the "511 Program") is to generate, analyze, and disseminate technical data on the effectiveness of such products.
Materials for Consumers
- Devices and Additives to Improve Fuel Economy and Reduce Pollution - Do They Really Work? (PDF)(5 pp, 115K, EPA-420-F-11-036, August 2011, reviewed September 2012)
- Federal Trade Commission Facts for Consumers: “Gas Saving” Products: Fact or Fuelishness? (PDF)(4 pp, 198K, September 2006)
- Federal Trade Commission Consumer Alert: Gas-Saving Products: Proceed with Caution (PDF)(2 pp, 70K, July 2001)
Materials for Manufacturers
- Program Overview Fact Sheet (PDF)(3 pp, 128K, EPA-420-F-11-013, June 2011)
- Program Description and Application Requirements (PDF)(14 pp, 40K, EPA420-B-00-003, May 2000)
- List of Independent Test Labs (PDF)(2 pp, 74K, EPA-420-B-13-054, November 2013)