I have a question regarding gas (no, not that kind of gas, but gasoline). I used to live in a lower altitiude area where the low grade gas was 87 octane, but I moved to a high altitiude area (4,000 feet) and the low grade gas here is only 85 octane. I have heard that with the higher altitude and thinner air that you can use a lower octane gas and the cars run just fine. I have done some research on the subject but haven’t found anything definitive.
My question is that both of my cars requite a minimum of 87 octane gas per the car makers. I know you’re wasting your money by using a higher octane than your car requires, so is 85 octane gas okay to use at higher elevations even though the owner’s manual calls out for 87 octane? I’ve been using mid-grade in the interium as saving $0.12 a gallon isn’t worth it if I damage my car’s engine. Can anyone clarify this one? Thank you.