
Octane and ethanol
Wondering what y’all’s thoughts are on this: I live at high (ish) altitude- about 6000’ above sea level. I always put premium in (91) her but it has ethanol in it. Was in the mountains over the weekend and found 91 without octane and she ran like a raped ape all the way home. There is a no ethanol option here in the city but it’s only 87. Is it better to do the 87 without octane or the 91 with?