From personal experience, BAD. Gas mileage suffers, and you can foul the O2 sensors.
Agreed. You are wasting your $$$. Only use in cars where the engines specifically call for high octane. Unless you have a old car with a lot of miles on it and you hear some "pinging".Good for the oil companies, bad for your wallet.
Does our element need 89s or 93s or is it ok to settle for 87?
I'd suggest reading the links, and maybe it wouldn't be beat to death...I dident read the links you guys posted but this has been beat to death in the past. Once upon a time I lived in a high elevation area and bought regular gas all the time and never thought twice about it. Then I moved to a sea level elevation and my car dident run as good, it was fine but Im sensitive to that sort of thing. I then started useing premium and it ran as it always had in the past. So judge for yourself but as for me I use premium. Useing premium will in no way hurt your car and anyone who tells you so dosent know what they are talking about.
I don't need to read my book again...I've talked to the design engineers...who have said that the engine is designed to operate optimally at the lower octane levels (they too won't specify a definitive level, but I suspect that's mainly due to the fact that they don't engineer fuel...Tim seriously my god!!! dident we talk about this like two years ago! Read your book man! I dont have mine infront of me right now but it says something like 86 or higher! I will point out again that 91 and 92 is higher than 86 so its ok to use! Read about what octaine means!