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Originally Posted by 46yblock  Here in OR ARCO uses either 5% or 10% alcohol. I dont remember because it has been a long time since buying gas from them. They are the only ones using ETOH, and the bottom end octane is 87 like the other stations.
I wonder if states where we found the lower grade at 86, were using alky blends (NM, TX, OK, KS)? Even if they were, that wouldnt explain the 86. |
Sorry. Using ARCO was a bad example. It all has to do with the octane number. I'd guess the 86 has a little less knock inhibitors.
Which in turn allows the oil companies to produce and sell it for a few pennys less. I don't know why they would want to do that in some areas and not others.
My Ranger Owner's manual states. "Your vehicle is designed to use "Regular" unleaded gasoline with a pump (R+M)/2 octane rating of 87.
We DO NOT recommend the use of gasolines labeled as "Rergular" that are sold with octane ratings of 86 or lower in high altitude areas.
To me that implies that if you use 86 octane in high altitude areas and damage your enging, your warranty might be void.