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[goldwing2000]

Wow BP has 98 octane? I remember when my town use to have a BP, but I havent seen them up north in years.

They use a different method to calculate octane down there. If you compared the two actual fuels (Oz premium using the RON method vs. NA premium using (R+M)/2 method), they would be approximately the same.

 

[jred321]

They use a different method to calculate octane down there. If you compared the two actual fuels (Oz premium using the RON method vs. NA premium using (R+M)/2 method), they would be approximately the same.

that's what i was going to say. plus any unleaded fuel shouldn't hurt your car, and leaded only kills your catalytic converter, neither will do anything real bad to your engine

 

[RED SP23]

They use a different method to calculate octane down there. If you compared the two actual fuels (Oz premium using the RON method vs. NA premium using (R+M)/2 method), they would be approximately the same.

Thanks for the info. RED SP23

 

[badAzLava3]

Octane makes sense if your car is tuned to use it.

Octane alone is not going to ruin anything.

If your car flows more air than stock, has a aftermarket exhaust etc, a little more octane will help you avoid an overly lean condition.

 

[majic]

our cars run rich as it is.. so there's no point of going more than 87octane.. CAI can actually help u with MPGs as long as you don't WOT it all the time

 

[goldwing2000]

Octane alone is not going to ruin anything.

Actually, that's not true. My girlfriend ran 89 octane in her car that was designed for 87 and after about a year, the spark plugs were completely burned out.

 

[Screamin'3]

For the most part I believe octain relates to the ignition temp of the fuel. ie. the higher the octain number the higher the ignition temp. In engines that have high compression or high engine temps require the higher octain to prevent detonation.
If you use a higher octain than your car was designed for there won't be much harm, probably not much good either. And your car may be harder to start on very cold mornings.

 

[M3 5MT]

I've been told that a higher octane rating means the fuel burns more effciently, meaning it ignites quicker, which means the engine should run smoothly especially when pushed. I've never heard of it having bad affects unless it was close to a rating of 100. I'm only basing this on what others have told me.

 

[goldwing2000]

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. Has nothing to do with efficiency. Here, read this:

http://www.howstuffworks.com/question90.htm

This one's even better:
http://theserviceadvisor.com/octane.htm

Here's one from the Federal Trade Commission:
http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm

 

[Greenbread]

wait so if u got an intake and after market exhaust still only use 87?

 

[goldwing2000]

Yes. Neither of those things affect your compression ratio. The only "add-on" that you'd need a higher octane for is forced induction.

 

[M3 5MT]

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. Has nothing to do with efficiency.

"So we want to match the correct octane rating of the gasoline to the engine design to ensure complete burning of the gasoline by the engine for maximum fuel economy and clean emissions."

I was wrong in saying that a higher octane rating is more efficient. It is infact the opposite. Using a higher octane rating when it isnt necessary will cost the user more money. That's not very efficient.

 

[tritonheat1]

"So we want to match the correct octane rating of the gasoline to the engine design to ensure complete burning of the gasoline by the engine for maximum fuel economy and clean emissions."

I was wrong in saying that a higher octane rating is more efficient. It is infact the opposite. Using a higher octane rating when it isnt necessary will cost the user more money. That's not very efficient.

Using higher octane means>Better Gas mileage!!!! I have drove from california to washington state a few times. Going from fresno to redding i got about 28-29mpg on unleaded fuel(87octane). Then from there i filled up with premium unleaded (91Octane), and notice a big difference in gas mileage i got 454miles on a tank filled up at 12.4**gallons= to about 36Mpg. Now that's a big difference, "using higher octane doesn't necessarly just mean better performance, it also mean's better fuel timing/spark!!!!

 

[M3 5MT]

Using higher octane means>Better Gas mileage!!!! I have drove from california to washington state a few times. Going from fresno to redding i got about 28-29mpg on unleaded fuel(87octane). Then from there i filled up with premium unleaded (91Octane), and notice a big difference in gas mileage i got 454miles on a tank filled up at 12.4**gallons= to about 36Mpg. Now that's a big difference, "using higher octane doesn't necessarly just mean better performance, it also mean's better fuel timing/spark!!!!

That's what I had claimed in my previous post. The link goldwing2000 posted said the opposite. At this point I dont know who to believe.