Many gas pumps have a sticker on them stating something about 'Pump May contains Gasoline with up to 10% Ethanol', or similar.
Not all states require the pumps to be labeled. All pump gas made these days has ethanol added, especially for the summer. Ethanol has even been found in pumps that don't state that their gas is ethanol-enhanced -
NC had a statute requiring gas stations to place a sticker on pumps denoting Ethanol-enhanced fuels - statute expired in 2009; stickers on pumps are voluntary, so you have no guarantee that the gas you buy is ethanol-free. Gas being sold in NC is based on 'reformulated gasoline base stock', which already has ethanol in it. The fuel depots add additional ethanol at terminal when they fill up fuel tanker truck for delivery to gas stations, called 'splash fueling' or 'splash mixing', Lack of a sticker does not ensure gas without ethanol is being dispensed from pump...
My research into fuels has shown info from the petroleum industry stating that the amount of Ethanol in the fuel batch can vary depending on the blending method used and the base stock process method used, e.g., 'conventional gasoline base stocks' vs 'reformulated gasoline base stocks'
Bottom line: lack of a sticker on gas pump does not guarantee no Ethanol in fuel...
'Tanner'