While traveling out west this summer I noticed most of the gas stations offering 85 octane and 87 octane as their mid grade. Has anyone tried this in their gasser? I wasn't going to try it especially ...
I use the octane recommended in my owners manual and am not overly concerned about paying a higher price over a lower octane when fueling in higher altitudes.
One must choose to use the octane works best for them in higher altitudes.