I recently moved to San Diego, CA. due to the NAVY. I am from Miami, FL. The gas out here is 91 octane where as in Miami we have 93 octane. Is it worth putting in 91 octane?? what would you guys suggest. I used to put in 87 octane all the time but my mechanic ( a mustang guy) suggested for me to start putting in 93???

 

Do you have a tune? Sorry I am on my blackberry so I can't see signatures. I would say if you use 87 and no knocks that's what to use, the owners manual will suggest what the recommended octane is, but if you have a tune you obviously should use the proper octane rating

 

Unless you have a tune use 87... there is no benefit to any other octane.

 

^^^ Actually hossy, thats not true...it'll save some 87 for the rest of us lol.

 

I'm actually in the middle of testing this theory, but I have heard from numerous places that a higher octane gives a longer range, and broken down with prices and mileage, higher octane actually saves you money. Also given, the higher octane will give a SLIGHT power increase (without a tune, more with one of course). Just remember, you can always run a higher octane than what is rated, never lower.

 

Good luck with that. Read a book on internal combustion engines first, then you won't be so apt to "test" theories and throw away all that money....

 

Your not going to get any more power out of running a higher octane gas..
Unless your car adds timing when you put in higher octane gas... which a 2v GT Does NOT do.. all your paying for is empty hopes and dreams.

 

ive heard that some of the newer cars like th g8 does that get a lil more hp with running 93 instead of 87 and maybe he's basing the "get more mileage theory" off the fact that the higher the octane the fuel burns slower than the lower octane but its better for high compression engines more so. never heard of it increasing in our cars though

 

not my words::::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 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

 

not my words:::Auto manufacturers can boost a car's horsepower by increasing "its compression ratio." But here's the rub. Change an engine's compression ratio and you must use a fuel with a high enough octane to handle it. So if, for example, your car requires 92 octane and you fill 'er up with 87, the engine will "knock" and can become seriously damaged. However, if your car requires only 87 octane, don't bother with a higher-grade gasoline. You won't see any improved performance or mileage