Octane

[Homeslice]

Originally Posted by Sean

The car wants 93 but we only get 91 at the pumps, so when I do a track day or some hard canyon miles I have to mix in 4 gallons of 100 to get it up to 93. It's annoying. Some 76s out here have unleaded 100 at the pump, but they're not exactly common.

The higher up you go (in altitude), 91 will start to perform like 93 anway.