I have use 87 89 91 and to be honest the only real difference I have notice is when I pay for it :lol:

 

Octane rating have nothing to do with acceleration or smoothness. Only for preventing pre-ignition and pinking. Corolla is designed to use 87. Any higher is waste.

 

X2

 

Blend your gas.

I use 87 octaine gas and it seems OK with me. If you see the need to use a higher octaine, why don't you add a 1/4 tank 89 or 91 to see if it your engine runs smoother. It may also be the cold weather that causes yourengine to be rough in cold weather.

 

8 months ago I tried 10 tank of Octane 94 gas. During the time I had that gas in there, the car had difficulty starting...Don't know why...

 

anyone who thinks 89/91 octane will make their corolla faster, please just send your extra money to me instead. i will then send you a notarized certificate that declares you have the fastest car in the land. its a win win situation. extra money in my hand, and a document in your hand that will have the same value to your car as high octane fuel.

 

i use what's cheapest, and what the manual recommends.

 

there is actually more energy potential in regular grade gasoline then there is in premium grade. the reasons why many performance cars need to run premium grade fuels is that the compression ratios and ignition timing are set at the factory with more knock resistance needed. the higher octane ratios in premium fuel is what offers the knock resistance. its been proven with dyno testing that any given engine will make its highest torque numbers when running the lowest octane fuel that the engine will take without knocking and pinging

 

Yes. An engine can only make use of the higher octane gas if the timing can be advanced by the computer. But, there are other considerations for octane use as well. Very oversquare engines (large bores and short strokes) often (not always) need high octane fuel to keep it from igniting in one spot before compression. Valve timing is also a consideration, as are the number of valves, size of the valves, and placement in the chamber.

There is a misconception, propagated by oil companies, that higher octane is better. They charge a ton more for it (in Canada, anyway) and make huge money from folks that think they are doing something better for their car, but are not.

Toyota engineers design engines wot work within certain parameters and conditions. Some engine computers have the ability to advance the timing slightly and perhaps even the valve timing (through VVT-i) to take advantage of different octane levels, but realistically, the gains are going to be small. The intake and exhaust size, valve size/placement, and so on are the same.

Our Corolla runs superbly on 87, and I'll pocket the 10-12 cents per litre for myself. Toyota recommends 87, and 87 it is.

 

87 regular here.

 

87 regular here too. I've read too many articles to bother wasting anything further in the 2AZ-FE engine. Now...if the manual called for a higher grade then I'd have no problem with that.

 

87 enough said.

 

higher octane rating does not improve anything, The corolla engine is designed for 87 so just go with the manufacturer!!

 

higher octane rating does not improve anything, ...

... in fact, if you use a higher octane than what the car was designed for, you could end up with unburned fuel. This is where the sports cars using 91 or whatever octane come in.

87, and won't change 'till engine mods require me to do so.

 

87 all the way and no problems so far....it's useless to go higher, just use what the manufacturer recommends...the manufacturer is not gonna recommend something lower than what's optimum for the car

 

1.8L

87 since day 1

 

91 since day one,

 

Seems you're the only one.
Any reason for using 91?
What does your manual recommends?

 

Below sea level maybe 91. Like everyone else has said, you'll get best combustion and power, and best MPGS with 87. Really, any further discussion is....
:deadhorse

 

I say 87. If you use anything higher it can cause a lot of damage in the future. You have to watch, if you start putting high in it can mess with your O2 sensor, your MAF your Caytlac converter (sp) and a lot of other things. 87 is the best, besides why pay for high gas when your just going to use it as much as you do with 87 anyway. It's designed this way for a reason, you aren't driving a M3, it's a Corolla!

 

87 octane



The fact that 99.9% of Corolla owners use 87 octane with good results, plus
it's recommended by the manufacturer should tell you that if your Corolla doesn't perform properly with 87, then suspect something other than octane as your problem. Concentrate on using multiple tankfulls of 87 octane and if
things aren't acceptable, then head for your Toyota Service Dept.

 

actually, Shell works differently. 87 octane causes buildup in engine grime (as shell claims) or w/e and their V-Power 93 octane cleans it. so, there probably is some benefit in running 93 octane.

 

actually, Shell works differently. 87 octane causes buildup in engine grime (as shell claims) or w/e and their V-Power 93 octane cleans it. so, there probably is some benefit in running 93 octane.

No. This doesn't mean running the higher octane is better. The only reason you'd need a higher number is to help prevent pre-detonation.

 

me too i use 87 after the full tank of gas that came from toyota

 

87 Unleaded only, no ethannol.

 

I just bought my 09 3 weeks ago and use 87 octane seems to run ok, Still breaking it in @ 4900 miles.
MPG keeps going up slowly at 31.1

 

Stick with me here. I'll get to the point at the end but I need to build the case.

In addition to my 2009 Corolla, I also have a 2005 Sienna and in the user manual it says that it can use either 87 Octane or the higher 91 Octane.

If you think about it, what is the purpose of the different Octane ratings? (This is a bit technical but trust me or you can look it up.) It is to prevent pre-ignition or "ping" based on the compression ratio of the cylinder chamber. You can prevent "ping" with higher Octane gasoline or by retarding the timing. On my Sienna, the computer automatically adjusts the timing so that it advances quicker with the higher Octane gasoline. I have noticed a performance difference with the different grades.

So now we get to the Corolla. The user manual recommends 87 Octane and doesn't mention anything about using higher Octane. So does the Corolla's computer have the automatic timing adjustment? I believe it does based on how the car performs. I notice a difference when going up hill or onto freeway on-ramps. The 87 Octane feels sluggish compared to the 91 Octane. It does not feel like a V-8 was installed but the sluggishness disappears. On flat roads, there is no noticeable difference.

There's my case, try it out and report back on what you find.

 

this is just me, but 91 is always supposed to be better than 87 if only you can afford it. on the corolla manual it says something about using 87 followed by words in parenthesis (91 octane) or something.

 

Use what ever you want... the cars run great on 87 Octane... No difference on 91 Octane.. You won't gain power, and you won't get better fuel economy. 91 Octane is designed for Higher Revving / Higher Performance engines that require a higher compression ratio... Neither the 1.8L or the 2.4L corolla's require that higher compression ratio fuel [unless you have done some serious mods to your engine].

So if it makes you feel better by putting 91 octane in your car, then by all means do it. Spend the extra cash... I am coming from a car that only ran on 94 [due to mods], and let me tell you this 87 Octane is a blessing for me. No more Sunoco Only pumping. I'm not putting anything higher in my car unless I have to.

 

If you're engine does however start having the Knocking/Pinging symptoms... then by all means use higher octane to eliminate the knocking and save your engine.

and the manual does say..

"Unleaded gasoline (87 Octane rating [Research Octane Number 91] or higher)"

So if you're engine runs good and does not knock then you don't need higher...

 

If your car is knocking on 87, change gas stations right away and take your car to the dealer. It's equipped with a sensitive knock sensor, and if you can hear it knock, something is WRONG.