How to verify if gas contains ethanol

[ccm]

Hi,
I know a gas station is supposed to put a sticker on the pump if his tanks contain ethanol fuel but my trust level is pretty low. what I want to know is if a station does not have the ethanol sticker, on his pumps, is there any quick and easy way to tell if the gas contains ethanol? I have read where some people say they can smell the difference but did not specify the difference in smell.

I appreciate any replies.

ccm