91 No Ethanol

[LoveOldSteel]

Would the 91 be too high of an octane for my 1977 1450? Or would you run 87 with an additive to negate the ethanol? I thought I was doing my boat a favor by using the 91 until the mechanic informed me otherwise.

[Mike McKown]

No and no.

[ol'George]

Higher octane on low compression motors is not economically advantageous,
and at times decreases power, but it is negligible from the operators seat.
Higher octane burns slower.
I'm not a fan of today's 10% ethanol, but have used it with mostly no problems.
What I do encounter are problems with corrosion in fuel systems like carb bowls/jets emulsion tubes where equipment sets idle for more than a couple of years.

[finsruskw]

We are lucky here in Iowa as most of the Casey's stores have non ethanol gas at the pumps
I use it all the time and add 1 oz MMO per gallon.
No fuel issues here.

[MrRazz]

I run 90 non ethanol in my 1250 with no issues

[LoveOldSteel]

Thanks fellars.

[ol'George]

In these parts it is not worth the extra $1.25 a gallon for non alky gas
and having it be a year old or more.

[Mike McKown]

The only opinion I have on using E 10, 87, 89 octane gasoline for the last umpteen years is, if you store the stuff in sealed containers, don't let it sit in an unused gas engine for 3-4 years, you'll have no problem with it.

If you choose to do otherwise, you can have problems with moisture.

Water in gasoline used to be a problem before E 10. Corrosion, dried gas varnish and all that stuff is nothing new.

Don't blame it on E 10.

[Merk]

Agree with Mike
Poor storage habits causes more problems