If I use 10%ethanol will my o2 sensors see cleaner exhaust and up my gas ratio ?

Just started seeing 10% stickers on gas pumps. Wont it burn cleaner with more 02 and increase fuel to air ratio messing with my gas milage.I know ethanol is 30% less efficiant than gasoloine which will lower my milage considerably.The ethanol is 10%.I dont want gas with ethanol im not a corn farmer. What a scam !05 silverado 5.3