No, I said just dump, 100 octane. No two grades. All these aircraft engines could be modified without degrading their power outputs. Most turbo charge airplanes would just need to add inner coolers or larger inner coolers to handle the new 94 UL as the only fuel available.
Most turbo charged piston engines only have compression ratios of 7.5 to 1. The big myth, is that these are high compression engines and have to use 100 octane fuel.