The first turbocharged cars from GM used ethanol to counter detonation.
https://www.oldcarsweekly.com/features/olds-f85-jetfire
Quote:
The little Jetfire was based on Oldsmobile’s F-85 series. As a result, it used the same aluminum-block 215-cid V-8 that survives to this day in the British Land Rovers and Range Rovers (albeit bored out a bit).
Oldsmobile added a waste gate, kept this engine’s 10.25:1 compression ratio and suppressed detonation with a water-and-alcohol injection system. This system included a tank under the hood for “Turbo-Rocket” fluid. The turbocharger’s boost was limited to 6 psi.
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