Originally Posted by
elmshoot
Av Gas will have no impact on the build up of carbon. I assume you are considering running 100LL avgas there are many kinds but that is the most prevalent type of fuel.
Lower octane would be better 80/87 ava gas. Higher octane fuel burns faster. Stay with regular pump gas if you can find it with out any Alcohol that is better you can search the internet for availability near you.
Sparky
Higher octane merely raises the flash temperature. How would that make it "burn faster?"
I have found just the opposite with my modified 500 HP N/A Gen 3 5.7 Hemi. 110 octane racing fuel reduced low end TQ and killed my 60' times compared to 93 octane unleaded pump gas with 10% ethanol.
Unless the engine requires higher octane due to spark advance and/or compression ratio, higher octane can not increase power output. In fact it is far more likely to reduce power.