You guys are lucky to be able to get ethanol free gas.
Only a couple of Marina's have it around here, and it's very pricey.
Found a few places that sell racing gas, but it's $17-18 per gallon!

 

Stock bike like mine I run all 3 grades never had a problem
Extremely hot weather and red light area I'll use the good stuff

 

Several gas stations around where I live have ethanol free 91 octane, so that's all I ever use. Once I start traveling this summer, that might change, though.

 

Ethanol free is rare in Texas. When I was traveling in Florida it seemed it was all over the place.

 

I have a couple stations near me that have Ethanol free in 89 or 91 octane. That's what I use in my bikes, car, & truck most of the time. When on a trip I buy whatever is handy at the best price.

 

http://www.pure-gas.org/

 

I go for the higher octane rating and I use Sta-Bil marine quite frequently.

 

The question regarding which octane grade is the right one to use is a very close 2nd right behind "What's the best oil to use?". I guess that no one ever reads their Owners Manual any more or they manage to become "Internet blind" and completely forget how to use a search engine once they join a Forum.

 

I have been running 87 E10 for the past decade in my H-D collection of bikes from 74 and 80 cu. in Evos and TC's from the 88 to 120's. All without a single running issue.

I do add oil coolers to the ones that did not come with them, use iridium plugs and a power AFR instead of an emission compliant AFR. I also do a carbon cleaning every 2 to 3K.

In that time I have ran them over 300K.

All vehicles sold in the US to run on public roads are mandated by the government to be able to run on 87 octane. H-D can only recommend higher octane they can not and do not require the use of higher octane.

Some argue that they can only follow H-D recommendations on octane. However they fail to understand that most use other brands of oil, tires, seats and a myriad or other aftermarket parts all the while H-D only recommends their branded licensed parts.

H-D recommendations serve their interests and not the end users interests.

 

I use the ethanol free which is available in the town I live in. The highest ethanol free available right now is 89, but sometimes it's 87. It runs great in my 10 Ultra and I can't tell any difference between it and the 91 octane. The ethanol free seems to provide better gas mileage but I haven't verified the numbers. I also use e-free 87 octane when 89 e-free is not available and can't tell any difference between it and the 93 octane ethanol fuel that wal-mart sells at Murphy's. The twin cams seem to be happy with just about any fuel 87 and up octane.