Same with E85, Sept 2020 ish, and it was 29% cheaper than 91. Actually cast the same to go 100 kms, (MG ZS) using all 3 (91, (E20 or 95), E85), but performed just a wee bit better on E85, since designed for it. 11kpL vs 14kpL, E85 vs 91.
Now they are almost same price, 36 ish to 37.5 ish. I keep on have to adjust my #s calculating the savings ... in a good way.
Staying On Topic of course ... them damn CSs, actually easier to find than E85 petrol now ????