The only way to tell whether ethanol is present in gasoline is to look at the gasoline pump. If it contains ethanol, there should be a large sticker on it stating what percentage of ethanol is in the gasoline.
It depends sometimes it can sometimes it doesn't.Normally if you look at the sign that tells you the prices when your on the road it should say contains ethanol.
In the USA, none. The MTBE ( a water pollutant ) was replaced by the corn liquor a few year back at a maximum of 10% ethanol to 90% gasoline per gallon. No brand of gas is 100% ethanol free at all...