EPA (fuel economy data)
The U.S. agency whose standardized tests produce every official MPG and range figure.
The EPA, the U.S. Environmental Protection Agency, runs the standardized tests behind every official fuel-economy figure: city, highway, and combined MPG, MPGe, electric range, and CO2 emissions.
Because every vehicle runs the same procedure, EPA numbers are the one fair basis for comparison. Trimslate's efficiency data comes from the EPA's public fueleconomy.gov dataset, and every EPA-sourced value carries a source badge.