Pump gas with ethanol?

[CB_Rob]

Do any of the kits work with 91 octane gas that is up to 10% ethanol?
The typical premium you find im mountain towns...
For use at 9000 and up?

Ethanol should increase the octane number, right?

 

[Betterview]

Do any of the kits work with 91 octane gas that is up to 10% ethanol?
The typical premium you find im mountain towns...
For use at 9000 and up?

Ethanol should increase the octane number, right?

Ethanol increases the octane, but it requires a richer mixture because the ethanol "alcohol" is largely oxygen in a liquid form, thus in effect it leans out the mixture. In theory running 91 octane with 10% ethanol at high altitude with the ethanol setting should increase performance