It is clearly preferable to use non ethanol gas in our RV -12's, as spelled out in this service bulletin. However I cannot get higher than 89 octane fuel without ethanol in southeast SC and northeast GA.
With that in mind I thought a 20-25% mix of 100LL with 89 octane ethanol free would work. Lockwood aviation in strong language advised: never upgrade 89 octane by mixing with 100LL (Mixing 100LL with 91 or higher octane is permitted). Pressed they could not give any technical reason why.
I cannot see the logic in this. With this service bulletin, I am thinking about disregarding Lockwood's "prohibition". Anyone have any thoughts or advice on this?
Doug Dahl
RV-12, RV-9A
With that in mind I thought a 20-25% mix of 100LL with 89 octane ethanol free would work. Lockwood aviation in strong language advised: never upgrade 89 octane by mixing with 100LL (Mixing 100LL with 91 or higher octane is permitted). Pressed they could not give any technical reason why.
I cannot see the logic in this. With this service bulletin, I am thinking about disregarding Lockwood's "prohibition". Anyone have any thoughts or advice on this?
Doug Dahl
RV-12, RV-9A