If it was 91 w/o Ethanol it would be true due to spec blending. The octane posted is the minimum. But if it's 91 octane w/ 10% ethanol it's actually 90% 89 octane mixed with 10% Ethanol. While 93 octane w/ Ethanol is 90% 91 octane Gasoline with 10% Ethanol which makes it 93 octane.
In general assume it has Ethanol unless otherwise noted. Also "pure" gasoline will be significantly more expensive than Gasohol. I haven't read the actual law on how much Ethanol is considered to be Gasohol but I believe it's about 5% for the Federal requirement. It could vary between states though. Some states require signage if Ethanol is present and some allow Ethanol free gasoline to be sold statewide.
Quote:
Originally Posted by Someguyk
well we only have 90 ethanol free gas here..and that is the highest besides the 100 octane at the airport.
|
Nope, and you probably won't since it's Alaska. But they use Ethanol in Canada.