i agree and id like to also add to it.MX-SLICK wrote:FAYI: Higher octane gas does nothing different than normal octane gas in an engine that does not require it. Octane is a measure of how much pressure the fuel can withstand before it ignites (all fuel will ignite on its own under a certain pressure) If your engine has HIGH comression, then it may pre-ignite regular octane fuel, this is why high octane fuel is available...because it simply withstands higher pressures without spontaniously igniting. If your engine doesn't need it,..... then puting it in you car is like throwing money away..because it does nothing. High octane fuel does not burn cleaner, does not burn hotter, and does not burn "more evenly" You would be suprised if you asked around and found out how many people mindlessly fill up with high octane fuel...I have heard people say "high octane fuel makes your car last longer" or "it burns cleaner, or hotter, or better" when it doesn't....Im sure most of you guys already know this, but I think it is important for somebody who might not know this to learn and stop wasting money at the pumps....
our (north america) octane rating formula is not the same as in other parts of the world. RON and MON octane rating is based on the composition of the gasoline. this is why we use RON and MON for our octane calculations. if you go to the gas station you will see (R+M)/2.
our CLC rating is based on RON and MON Ratings.
CLC= (RON+MON)/2
use the simple formula and choose your fuel octane accordingly.
as you can see:
91 ron = 83 mon = 87 clc
95 ron = 87 mon = 91 clc
http://www.refiningonline.com/Engelhard ... CR4_29.htm
most cars use 87 or 91 CLC octane. states that have 93 can charge a little more for 93 than they could if they sold 91. its the oil companies way of extracting as much profit margin as possible. most states still have 89 octane gasoline which is the same idea as 93 octane.
i do not know the octane rating formulas of other countries.