AZ only has E54 now, any other states like this?

[2011 gtcs]

That's a fricking bummer stupid az voted down weed now this, **** man sucks I gained 27 hp using e85 b4 I'm just intake and exhaust. I threw a GT350 Manifold on and getting it dyno tune today and I was like I got e85 in the trunk and he was like no its e54 now I'm like damn it I was hoping for some sexy gains well still be better than 91 I'm thinking but who knows.

I only lost 2 degrees of timing going from E85 to E54, you shouldn't lose more than 10whp and it's safer than 91

 

[c6zhombre]

Went to the same station Stripes I filled up on 9-16-16.....tested E90 today!

So far, that "54-83" sticker has not been accurate. Tested higher than max (86 n 90) the two times I've filled up the past 2 months

 

[DHG1078]

Is an E55 tune safe for E85 gasoline? If not, you guys may have to get a few tunes that run the gamut of ethanol content ratings and swap tunes as your tests indicate.

I wonder if they do this during the winter due to ethanol's propensity to absorb moisture? Lower the ethanol content, lower to potential water content.

 

[DHG1078]

A quick search has a couple sources saying its due to cold starts in the colder temperatures due to flash points and vapor pressures and other such science stuff. Every region runs a different class of ethanol at different seasons. Class 1 being a "summer" blend with the highest ethanol content. They talked about 70% being to lowest ethanol content allowed though, not 55...

 

[c6zhombre]

Yes I've always read they lower it for cold starts in northern states.

I left 1 gallon of pre tested ethanol in a plastic container for 9 months in a very humid garage. It tested 85% at the pump. I tested it again 9 months later and got 85% again. No additional water that I could tell....or one would figure the ethanol test would have changed.

I dumped the gallon in the car and it ran just as good as it always does. No issues.

 

[MG0h3]

Is an E55 tune safe for E85 gasoline? If not, you guys may have to get a few tunes that run the gamut of ethanol content ratings and swap tunes as your tests indicate.

I wonder if they do this during the winter due to ethanol's propensity to absorb moisture? Lower the ethanol content, lower to potential water content.

Running a higher ethanol content than what you are tuned for will leave you lean. As the number goes up, there is less gasoline and you need more volume.