Just looked at my local gas station.
Regular ethanol(E-10) gas is $3.04 per gallon.
Regular ethanol-free gas is $3.95 per gallon.
That is quite a big difference in price!
This site helps you find (and avoid) petrol stations selling E-15.
http://www.ethanolretailer.com/flex-fuel-station-finder
Snopes has an entry about E-15.
http://www.snopes.com/politics/gasoline/e15.asp
What to know about the E-15 gas blend (they downplay its problems)
http://www.myfoxtwincities.com/story/23824572/what-to-know-about-the-e-15-gas-blend-debut
More than that if you're pulling a load, and in my experience the loss is proportional to the size of the load. In other words ethanol is just a way of watering down real gasoline without using water.
does this mean i can put pure gas in my new ford?