By my guess estimate the home brew was around 98 to 99 RON. Yeah your right I do run it rich......
Its home brew not the lab so there is always risk. If someone wants to try it the risk is on them.
Then again people are having issues with Pump gas and will nilly mixing methylated spirits to get rid of moisture and dumping in full bottle of octane booster etc.
You should get your car tuned on the fuel your going to be using and its good practice to fit and use a wideband 02 sensor to monitor
AFR and data log etc.
91.6 RON.
+POS 97 RON.
+10% Methylated Spirits 98 /99 RON.