My 1995 115 Mercury outboard manual says E10 is okay to use and I've never had a problem with it. My manual for the 1999 Sienna also says E10 is okay to use and my 1991 Camry V6 (original owner) ran E10 until I donated it in 2020.

Since only about 1.5% of gas stations nationwide sell E15 (and conversion cost is prohibitively expensive as a short term investment) I doubt it will be a problem to get E10.

Well, I posted two source links but you seem to have ignored them. Here's one of them, the Des Moines Register.

Sunlight drives the reaction that creates smog. And, as a result, the U.S. Clean Air Act bans the sale of E15 from June to Sept. 15 in some states.

Please provide a link for a difference of opinion.

President Joe Biden and E15: What to know about the renewable fuel

Yes. 10% has been approved by Toyota engineers yes ago. However, they really recommend never exceeding 10%.
The saving grace is only 1.5% of gas stations. So it's less the 2 stations out of a hundred..

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In my state E15 is available all year round and 10c cheaper then E10


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You have the "slower burn" portion correct - but you have to ignite the fuel EARLIER (advance the timing) to get max torque from higher octane/ethanol content.

Of course, E15 fuel with the same octane rating as E15 fuel would likely burn at the same rate. The rest of the fuel could be lower octane to make up for the extra ethanol content.

-Charlie

We have very few stations around here with e 15. Mostly around the larger cities. Must be a central state thing.

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I think the reasoning behind removing the ban is to help out some areas of the country that the switch causes seasonally higher prices. This won't help where I live in CA as the winter blend contains more butane, not ethanol. Besides the gas stations always hike their prices at every major national holiday to make more money anyway. For 4th of July week it's not going to matter if they have 10% ethanol, 15% ethanol, or 20% cat pee. It's still going to cost more than it did the week before.

What it really is a minor policy change being announced as a major relief.

Maybe. I think ts not going to help a thing.

It will actually make things worse for a pile of people.

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Rutters is the only one in my area with E15


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I lost the last ethanol free gas station around last year, I was so sad. Also was the last station stull using an analog display. At least it still lets people fill tires for free. I can still get ethanol free, but I would have to get the expensive high octane which is unnecessary.

I don't think I've yet encountered E15, the pumps are annoyingly vague when it comes to ethanol content. They always say "up to" 10% ethanol. Imagine buying protein powder and reading that it contains up to 10% flour, you'd probably assume that they are ripping you off. I don't see how being vague about the ethanol content is any different, your potentially buying gasoline with 10% filler.

Would higher ethanol cause smog check problems? That would really be the feather in the cap, especially since I have CA smog this year.

Exactly. This is the political establishment presenting the illusion that they are doing something about ridiculous dramatic steady rise in fuel prices since Jan 21. (that they created) Much like "releasing strategic oil reserves" or saving $0.16 on 4th of July cookout costs. $0.10/gallon savings...what a relief!

I feel like minor is even calling it a stretch. The most irritating part about it is watching how heavily some politicians are praising it - even as far as going onto social media to convince people it's actually better for your car and a better fuel all around. At a point its almost like theyre trying to sell it as E85. Just blood boiling

E85 isn't 85% ethanol, either. It is often as low as 70% ethanol. That's why they need an ethanol sensor in the fuel system - to pre-adjust the fuel and timing maps for the actual ethanol content of the fuel. It also makes tuning for E85 without a flex fuel sensor a pain and risky.

-Charlie

Yeah I've heard that before. I read of some tuners mixing in a weak solution near E55-60 on purpose and then advancing timing as it would be catastrophic to set the timing on real E85 then get a tank of E60 without the driver knowing it.

The real life truth