Oxygenates raise the octane.Originally posted by: Mill
Originally posted by: OS
Originally posted by: Mill
Originally posted by: OS
unfortunately, us kaliphornians are stuck with piss 91 octane as the max.
Why is 91 the max? Thought most of the US had 93. Is it state law?
Some emissions thing, something like they oxygenate the gas to reduce emissions, but it lowers octane also. CA being the smog nazi state and all.
Kind of sucks cause supposedly my car has knock sensors and it retards timing for crap gas. 91 is getting expensive, so I might have to start using 87.![]()
How terrible. I've never owned a car that required less than 93, so I would be fairly pissed.
So I'm not sure why their max is 91.
Don't buy 87 if your car takes premium. Even if it does have knock sensors, it's just not good.
