In Canada, the chains Mohawk and Husky both advertise using ethanol as if it were some kind of godsend. So sad it's funny... it's like a restaurant advertising "eat here and we'll kick you in the balls, yay!" I've only filled up there a handful of times, and every single time I get terrible gas mileage, with all the vehicles I've driven.
http://oee.nrcan.gc.ca/Publica...s.cfm claims that gas with 10% ethanol increases fuel consumption by "about 2-3 percent", but in my experiences 10% ethanol = 10% increase in fuel consumption.
I believe winter blends in other gas stations around here (Shell, Esso, Petro Canada, etc) use ethanol as a gas antifreeze in their winter blends, and I get a similar result with my gas mileage all winter... about 10% more fuel used. This drop in fuel economy is in both regular and premium gas.
They claim it's a "green alternative", but if it's increasing fuel usage by 10% then it doesn't seem that green to me.