Is it possible to mix 91 and 100 octane to produce 93?

[Orguss]

There are places that sell the 100 octane Sunoco fuel on the pump. It'd be nice to know what ratio to use when filling the tank to get 93 so I can use the LMS 93-octane tune.

 

[SHOdded]

Should be a straight ratio, no? 7/9 gas 91 octane, 2/9 gas 100 octane. So for 20 gallon gas, you would fill with 15.5 gal of 91 and 4.5 gal of 100.

As far as using Sunoco, I hope their gasolines are actually what they label them as on the pump. At least in other parts of the country, it has been one of the lowest quality. If this does not work out, try another brand 91 at least. Worst comes to worst, ask LME if you can run their hottest tune on 91 gas.

 

[Orguss]

I was going to mix Chevron 91 with the Sunoco 100. There might be another brand at Sonoma Raceway. I'll have to drive up there and check. They don't list their fuel on the website.

 

[SHOdded]

Let us know how you fare, and good luck!

 

[Livernois Motorsports]

You can mix...BUT WE STRONGLY RECOMMEND THAT YOU DO NOT!

There is almost infinite room for error!

 

[Livernois Motorsports]

Worst comes to worst, ask LME if you can run their hottest tune on 91 gas.

I advised him against it. We tune with exact parameters, so the ECU not having enough octane to do what we ask can break stuff. This is where our familiarity with the EB comes into play.

 

[SHOdded]

Can he safely run straight 100 with the 93 tune (I realize it would not be optimized)? Mixing is definitely not an exact science since we don't start with a dry tank, and rarely have 100 right next to the 91 at the same station.

 

[Livernois Motorsports]

I would rather waste a few octane points and run 100 on our 93 tuning!