Can I safely mix 91 and 85 octane to reach or exceed 87 octane?
I love where the lowest grace octane available is 85. My 2015 requires at least 87 octane. Costco is the cheapest place to get gas, but they do not have 87 octane. Can I mix the octanes safely without messing up my engine? Maybe even doing 75% 91 and 25% 85?