Originally Posted by chr0mius
Midgrade is bs, I saw a study that showed there'* no noticable difference between 87 and 89, and 89 and 91. Just go with the top or bottom for the most noticable differences.
89 and 87 make the stark difference in terms of knocking for me... I'm too lazy to retard timing and lose power now that winter is over and it'* getting warmer (yes, I have a distributor) - where I used to knock like a bitch just trying to hold 70mph on a slight incline at 10 degrees C outside, I can practically floor it with zero knock. 2 octane points did it.
MPG study with the 89 octane coming soon.