Here's why:

* Government Mandate: The U.S. government mandates the addition of ethanol to gasoline (typically 10%). This is done to promote the use of renewable fuels and reduce dependence on foreign oil.

* Cost-Effectiveness: Ethanol is a cheaper alternative to pure gasoline, making it economically beneficial for fuel producers.

* Availability: Finding pure gasoline without ethanol is extremely difficult, as the vast majority of gasoline sold in the US contains ethanol.

However, you might find:

* "Non-Ethanol" Gas Stations: These stations are often located in rural areas and cater to specific customer needs, such as for older vehicles that might be incompatible with ethanol blends.

* Aviation Fuel: Aviation gasoline typically does not contain ethanol.

* Racing Fuel: Some racing fuels are specifically formulated without ethanol.

Important Note: It's crucial to check the pump or consult the gas station attendant to confirm the ethanol content of the fuel, as some brands might offer both ethanol-blended and non-ethanol options.