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View Full Version : 94 Octane, noticeable difference?


tremblay
10-12-2010, 06:30 AM
So i've always been putting 91 octane in my car but yesterday I was at the gas station and they had 94 octane so I decided to go with that instead. Seems to me like the car is running smoother. Would I notice the difference if there was any or is just all in my head? :lol:
fastblackmerc
10-12-2010, 06:55 AM
So i've always been putting 91 octane in my car but yesterday I was at the gas station and they had 94 octane so I decided to go with that instead. Seems to me like the car is running smoother. Would I notice the difference if there was any or is just all in my head? :lol:

Yes it's all in your head.....
tremblay
10-12-2010, 06:59 AM
I though so too. I guess i'll stick with the 91 and save myself a bit of money.
ctrlraven
10-12-2010, 07:36 AM
Get a tune and then you can run a higher octane.
rayjay
10-12-2010, 07:55 AM
Like Birdman said you are wasting your money unless you are tuned for it.
mercman1951
10-14-2010, 10:17 PM
Octane has to do with heat.

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting. The compression ratio of your engine determines the octane rating of the gas you must use in the car. One way to increase the horsepower (http://auto.howstuffworks.com/horsepower.htm) of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.

There should be little difference between 91 and 93.

Conspiracy theory kicking in here....

http://lmgtfy.com/?q=octane+ratings