7-11 93 octane

[adamsredlines]

There's all of 2 places that I know of in the "Tulsa Area" with 93 octane. I wish one of them was closer.
10.3:1 CR from the factory in a big car specifies 91 octane minimum, and if it was readily available I'd certainly be tuned for 93. I was when in Texas as it was everywhere down there.

 

[swampratt]

When a gas station near me opened and was selling the 105 octane E85 I had to try a mix in the old carbureted chevy engine.
I first mixed 4 gallons of 91 octane 100% gas and 1 gallon of E85 105 octane.. my math put that at 93.8 octane.
My car liked it. About 17% E85 is that right.

Many manufactures will not cover fuel related issues if running E15 fuel.