RON octane Options

[CoSo]

In the manual, it says that the Celica should run on 91 or higher RON octane.

I was wondering if there's any benefit to running 98 RON (as per BP Ultimate) consistently, and most importantly, whether it has any side effects or detriments to the car in the long or short term? Sorry if this has been asked before, search didn't come up with much.

[Supersprynt]

Mr. E. if you have a JDM ECu in your UK car, there will be a difference but thats ONLY because your Ecu is tuned for the normal Jap gas and not the gas thats commonly used in UK. Same thing with my car, I have a JDM ecu so I HAVE to use 93 in my car all the time. But the US uses an average of the Jap system and the UK system so your system is FAR below the Jap system, thats why you feel the difference.

I'm talking about the US, KC I have to disagree with you. What kind of slight difference are you noticing? If its so slight, you wouldnt be noticing it. Now wouldnt your fuel economy decrease if your car is advancing timing on a higher octane gas? The only reason its doing that is because its nto detecting knock, which is what higher octane gas does, deter detonation.

This post has been edited by Supersprynt: Feb 8, 2005 - 12:45 PM

[97GTinKC]

Mr. E. if you have a JDM ECu in your UK car, there will be a difference but thats ONLY because your Ecu is tuned for the normal Jap gas and not the gas thats commonly used in UK. Same thing with my car, I have a JDM ecu so I HAVE to use 93 in my car all the time. But the US uses an average of the Jap system and the UK system so your system is FAR below the Jap system, thats why you feel the difference.

I'm talking about the US, KC I have to disagree with you. What kind of slight difference are you noticing? If its so slight, you wouldnt be noticing it. Now wouldnt your fuel economy decrease if your car is advancing timing on a higher octane gas? The only reason its doing that is because its nto detecting knock, which is what higher octane gas does, deter detonation.
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Other than a seat-of-the-pants power improvement feeling, it does seem to get about 1-1.5 mpg better on the good stuff, and I do keep pretty good track of that, I set the trip meter every time I fill up. average 29.7mpg on the premium. a little better if on the open road at a steady 65-70mph. My reasoning is that if its making more power at the same throttle setting, I need less throttle to move the car at the same speed, so the fuel mileage also improves when driven normally. its not a magical 20% gain or anything like that, but when you drive a 4-cylinder every little bit helps. (These cars need a wider spread on the tranny gear ratios. )

This post has been edited by 97GTinKC: Feb 10, 2005 - 2:54 AM