I'm very tardy reporting my latest tank. I filled up last Monday, the 22nd!
Once again, because gasoline was over 10 cents a gallon cheaper than E85, I filled up with premium.
87 octane was $1.56. E85 was $1.69. Premium was $1.76.
I got 14.167 gallons of premium. The tank is now 11.5% ethanol. Octane is 92.7.
The last tank finished up with 23.5 mpg at 32 mph.
I don't notice the car driving any different with E20 or premium. They're equivalent, performance wise.
On the bright side, I saw that gas spiked to $1.66 today. E85 is still $1.69.