The federal Renewable Fuel Standard (RFS) effectively requires refiners and blenders to blend renewable biofuels (mostly ethanol) with gasoline, sufficient to meet a growing annual target of total gallons blended. Although the mandate does not require a specific percentage of ethanol, annual increases in the target combined with declining gasoline consumption have caused the typical ethanol content in gasoline to approach 10 percent. Most fuel pumps display a sticker that states that the fuel may contain up to 10 percent ethanol, an intentional disparity that reflects the varying actual percentage. In parts of the U.S., ethanol is sometimes added to gasoline without an indication that it is a component.
The federal Renewable Fuel Standard (RFS) effectively requires refiners and blenders to blend renewable biofuels (mostly ethanol) with gasoline sufficient to meet a growing annual target of total gallons blended Although the mandate does not require a specific percentage of ethanol annual increases in the target combined with declining gasoline consumption have caused the typical ethanol content in gasoline to approach 10 percent Most fuel pumps display a sticker that states that the fuel may contain up to 10 percent ethanol an intentional disparity that reflects the varying actual percentage In parts of the US ethanol is sometimes added to gasoline without an indication that it is a component