Quote Originally Posted by trism View Post
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.
Is what I said and thought, but according to Freddy, it's not so. I personally haven't seen 88 RON in over a decade, not even on my interstate trips. But if he insist, I've no reason to argue. I get the 10% being the maximum part, but considering ethanol is cheaper than petrol, you'ld assume fuel stations would want to be over, rather than under. It's a reason why the limit is a maximum yet not minimum.