Quote Originally Posted by ChaosMaster View Post
I mean if ULP is 88RON (which it seems to be in NSW) then E10 would be 91RON, where as if ULP was 91 RON (Vic), then E10 would be 94RON. Eitherway, E10 is safer than ULP.
Every state has the same fuel.

Regular ULP is no lower than 91RON. Ethanol has a RON of 109. so when blended with ULP in a 90/10 mixture, you end up with about 94RON. HOWEVER, its not always a perfect 90/10 mixture. That 10% is the MAXIMUM amount of ethanol that is in the fuel. It could be anywhere from 1% to 10%. Therefore, the RON of E10 will vary between 91 and 94RON

Then we have 95 and 98 PULP, which is ethanol free.

The 100 octane you see united selling is still E10, but its mixed with 98RON.

SOURCE; Have managed servo chains.