| Defiant,
I believe you are correct. - I know that gas station stock regular and premium. Their mid-grade is a mix of the two at the pump itself. Usually they are posted at 87, 89 and 93 octane. If the math equalled the chemistry, I think you would expect the midgrade to be 90. Next time I talk to a petroleum chemist, I'll inquire and post back. With that in mind, it makes me more hesitant to try the "cocktail" approach (at least until I inquire further). |