Can you still burn 100LL if you have the G100UL STC?

[MisfitSELF]

Since you're just "buying paperwork" with the STC and not changing anything with your engine, I can't imagine why you can't.  The GAMI webpage, however, doesn't specifically answer this questions.  It does state that if you have a Mogas STC you can mix it with G100UL but doesn't mention this in regards to 100LL.   

Anybody know?

Personally, it'll be sweet to be able to eventually use both in my IO-360 and I'd be happy to pay a few hundred bucks even if it's just paper once it gets proven out and approved for my engine.

[Fly Boomer]

According to George, yes.

[kortopates]

Yes, it's answered in the same answer about mixing with Mogas you mention, question 10 of their FAQ located here https://gami.com/g100ul/GAMI_Q_and_A.pdf:

"Yes. Comingling of G00UL Avgas and other gasolines approved for use in your aircraft is specifically authorized in the limitations section of the STCs.

[MisfitSELF]

37 minutes ago, kortopates said:

Yes, it's answered in the same answer about mixing with Mogas you mention, question 10 of their FAQ located here https://gami.com/g100ul/GAMI_Q_and_A.pdf:

"Yes. Comingling of G00UL Avgas and other gasolines approved for use in your aircraft is specifically authorized in the limitations section of the STCs.

Thanks.  Basic reading comprehension fail on my part.  I read that and for some reason only thought it applied to Mogas.

[carusoam]

It would make terrible sense if you couldn’t swap back when needed…

+1 For asking for clarification…

+1 For Paul’s responses….  

Technical documents like these take some experience to understand and use… their writing is done in a particular way for techincal reasons…

Draining a tank because it was half full, and you only had the other fuel available… would lead to known disasters…

PP thoughts only, not a mechanic…

Go MS!

Best regards,

-a-

[201Steve]

It’s been tested at various mixture amounts with no signs of trouble