Ive been using 87 non ethanol lately..been noticing a spike in fuel mileage varying between 1.5 to 2.7 mpg depend on my driving. I could only get 16.5 was my highest for mixed driving, i was able to get 18.65. Ive been tracking this through the fillup app!

 

That's about right. I have my own tank here and get my gas delivered by one of two fuel companies. One only has alcohol free and the other only has regular with alcohol and the prices can vary greatly. I figure about 10% better mileage with the non alcoholic gas and figure that into what I'm paying/getting out of it. Of course, the non alcoholic is better for the small engines around the house.