Originally Posted by BCThomas
Because if you had an 85% mix at a full 16 gallons, if you had 8 gallons of E and 8 gallons of premium non-mixed, it would mean that you had a 42.5% E? and so on? So if you mixed it down to say 2 to 4 gallons of E, wouldn't you be okay, and get a raise in octane rating? or does it not work that way? I am open to all opinions. Thank you in advance
BCT, the unfortunate truth is that E85 requires 15-20% more fuel per injection event than gasoline. Therefore, if you mix gasoline with E85, the end result is that your engine will run with less power, simply because the fuel energy in an equivalent volume of E85 is lower than the fuel energy in gasoline.
However, if your intent is simply to raise fuel octane, then, yes, it will increase the equivalent fuel octane. But with less available fuel energy per injection event, I think the end result would be worse than if the engine pulled timing on a tank of 100% gasoline.