6G Celicas Forums

Hey '94 GT owner, just wondering what gas rating you guys use. I've been using 87 and I think it's causing my engine to knock, so should I drive it untill its empty and start using 91?

I used 87 for the first few months that I had my Celica, then I switched to 89. With the 89 it seems as though everything runs smoother. I never noticed any knocking with the 87 while I used it and occassionally Ill use it ever now and then. I'm sure you can always try 91 for a month and see if the knocking ends.

89 is usually always cheaper than 87, so I don't know why you wouldn't use it.

I use 87 and am having no problems. In CA, 87 is bout $1.52/gal now, and 89 is about $1.65, 91 being about $1.75. I'm cheap. I buy cheap gas. It seems to work...

well for the last 3 months i been using 93 .... it last longer and my engine is knocking any more

89 is always $0.10 more than 87 where I live. How is 89 cheaper?

Thanks guys, I think I'll start using 89 now, see if that'll get rid of the knocking if not move on up to 91.

I always use 87 Octane because that's what our economy engines are designed to take. The gas shouldn't be causing any problems with the way your engine's running. You may need a tune-up.

Crap!! here in Chicago 87 is $1.73!!! the others go up by 0.10 for 89 and 91. I use the cheapest, cause im poor.

87 Octane is the lowest our engines should use. For everyday use I run 89. Every once in a while i put in 91. If youre only driving around town or something 87 should be fine, but if you drive a long distance very often id use the 89.

87 - 1.35-40ish

changes everyday here in fl

ya if you are knocking it most likely needs a tune up, you shouldnt have to need to use anything higher than 87, cuz the car was designed to be economical and use 87, 89 may help a bit but if you are knocking you really should need a tune up. theres no reason to go spend alot of money on 91, the car doesnt need it.

You don't need any higher octane than what your manufacturer recommendations are. It doesn't increase performance or takes better care of your car.

this is scaned out of my owners manuel



This post has been edited by macavely: Dec 28, 2003 - 1:47 PM

It's not causing your engine to knock. Probably the ignition system. All the higher octane does in helping this condition is it has a better detonation. Like the other peeps said you should get it tuned first to make sure. Higher octane is better but not needed. Unless you feel it makes your car faster.

http://speedarticles.com/auto_racing_article-46.html


This post has been edited by Toyolica: Dec 28, 2003 - 12:54 PM

i dont know if it makes my car faster, but i definitly notice a difference in smoothness when i use premium. Up here we have holiday gas stations that have 93 octane, and thats what i use for the most part.

This is from http://www.toyotacelicas.com/information/c...e/gasmyths.html

Using 91+ octane gas in a celica = waste of gas unless it's boosting.

Premium Gas Myths

Many people believe that “premium” gas is the best gas. Not true. Premium simply means “premium price” for higher octane. Octane is a simple measurement for a gasoline’s ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders.

Most gas stations offer three octane grades: regular (usually 87 octane), mid-grade (usually 89 octane) and premium (usually 92 or 93). The ratings must be posted on bright yellow stickers on each gasoline pump. The misnomer about octane is that the higher the rating, the better or more smoothly your car will run. In fact, premium gas can be bad for your engine if it was not designed to run at a high-octane level.

Although it may seem that the term “premium” or “high octane” implies that more energy is available, premium gas does not produce more energy than regular or mid-grade fuel. The octane grades are designed to accommodate engines with different compression ratios. High compression engines, found in most performance cars, require a fuel that burns efficiently at a higher temperature. That’s what premium fuel does, it burns hot under high compression. In a normal engine, premium fuel does not burn completely, resulting in excess carbon build-up and carbon fouling of the spark plugs. The end result is a less efficient engine that requires tune-ups more frequently. Oh, yeah, did I mention it also wastes money?

The only time you might need to switch to a higher octane fuel is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of cars. Check your owner’s manual to determine the right octane level for your car. Regular octane is recommended for most cars. However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knock.

thats a good article.

allright I'm putting 87 in the Celica next time.

I put 93/94 in the E420 but I guess that 11:1 V8 really needs it. However, when I read the Celica's owners manual, it says that 91+ will improve performance and is recommended... so I've always put 93 in the Celica (the only 91+ available)

??

This post has been edited by holson: Dec 28, 2003 - 5:36 PM

Ethanol, which I imagine most people don't have unless theres a Ethanol processing plant in your state...I guess I should have thought about that before I posted.

This post has been edited by Cody: Dec 28, 2003 - 8:56 PM