My local Exxon/Convenience store -- about 300 yds as the crow flies from my house (big intersection to cross) has ethanol free at the pump. Use it for all my small engine needs. Have experimented with it on a few highway trips as a found a Shell station on my route to Augusta GA from Charlotte that offered it for only 5 cents more/gallon than 87 octane with ethanol. There is a fuel mileage gain -- but it's predictable and minor. Takes about 30-35% more ethanol by volume to generate the same output as gasoline. So - E10 is 10% ethanol. Remove that and replace it with gasoline and you're 10% X 30% more efficient -- say 3%. On a 40 mpg vehicle -- 1.2 mpg. Within the range of variances due to speed, traffice, weather, etc.
--
82 242-6.2L; '17 Mazda3; '16 Crosstrek