I believe Shell V-Power is one of the few left with no or very little ethanol in it. That seems to lead to better mileage in some cars.
Originally Posted by Dinanstu
I don't think there's a benefit for ethanol on a turbo or supercharger set-up.
There is an advantage but it isn't fuel mileage. That's why you see high horsepower turbo cars tuned for E85.