I use 85+ in my '85 running B100. I've always been suspicious of "snake oil" but this stuff does seem to make an improvement in my fuel economy (2 ounces in the fuel tank per fillup). I need to finish the experiment by going back to pure B100 and see if the mileage goes back down.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970