I am confused about Sunoco Ultra94 fuel, 94 octane is good but it is done with a 10% ethanol blend. The V wants 93 octane and I am not sure there is any benefit to any octane level above 93. If the 94 octane level provides no additional benefit against detonation (max timing already at 93 octane) then the 10% ethanol by volume would actually decrease the energy content per unit of fuel, ethanol has less BTU energy than pure gasoline. So, is it better to use 100% gasoline 93 octane, or the 94 octane Sunoco premium with 10% ethanol (93 octane gasoline blended up to 94 octane)? Anybody have a preference? I have researched this and it seems to be a point of argument. I don't know if our SC engines benefit more from the higher octane or less from the 10% ethanol content.