Car and Driver octane test

Somehow that manual page forgot to mention that E85 has an octane rating of 100. I have used E85 frequently over the years, and exclusively for the last two years. My 2015 Chevy 2500 runs very well on E85, and my wife 2017 Equinox with the 11.2:1 ratio 2.4 motor really runs great on E85. And even with the lower fuel economy of E85, it is averaging about $.90 to $1 less than premium. And the actual real world MPG results show, on a fuel cost per mile basis, E85 is very competitive to Premium fuel in terms of actual cost per mile and how it performs. Far fewer combustion deposits with E85 and injectors stay cleaner. The air going in to the combustion chamber is more dense because ethanol has a great cooling effect on the air. The air is cooler in the combustion chamber on compression stroke and E85 has a far higher oxygen content in the fuel so these thing lead to a more uniform and complete burn. Talk to the racing and high performance community. Many of them use E85.