Premium Gas

[Pavel Olavich]

Originally Posted by Edd

Using higher octane than recommended will NOT make the engine knock*. It will make it less likely to knock. Higher octane = more stable and less likely to prematurely combust.
Members in this thread are correct in saying that you will most likely have no benefit from increasing the octane rating on the fuel (unless your car knocks at the recommended amount).
The top fuels (98 RON) are there to replace leaded petrol. Back in the day, lead was THE way to boost octane. Now we can achieve higher octane ratings without it, there is no need to burn lead in old cars.

*Heh, I just read the last couple of pages and I don't think anyone said it would. Nevermind then.

Edd, you make very good points. I just want to add that high octane is not just for old engines that required lead. In fact there are many very old cars that didn't need high octane, yet they did require lead. Even some 2008 models require high octane, for it's slower combustion properties; often these engines are large in displacement, and/or provide very high compression, and/or they utilize a turbo that requires a delayed burn inside the cylinder.

Reality Check Folks: Our small 1.5L low compression, non-turbo, low, low performance Yaris cars are the LAST car to get any benefit from high octane gas.

Lets get real here folks....most of the "benefits" many think they get is all in their heads....anyone hear of the Placebo effect?

Funny how age comes into play on this issue. My two teenaged daughters, both drivers, have several male friends in their age group, that all drive late model Japanese cars that DON'T require high octane, yet they ALL only use high octane gas, as they all have this dillusion of premium giving more "power" and more "speed".

Teenagers! Youth! LOL

Save your money, and be happy.

[marcus]

so whats the verdict on this topic?? is premium 89 octane gives out better mileage or is it regular gas 87 octane.. what is it??

[Speedz]

Originally Posted by marcus

so whats the verdict on this topic?? is premium 89 octane gives out better mileage or is it regular gas 87 octane.. what is it??

There isnt any noticeable difference in performance or economy when using 87 or 100... I tried all of them... nah zilch nothing...

Only thing is your money been spent... mine you in Australia Shell's 100 octane was about $1.45/L vs $1.06/L for the 91 octane...

[eTiMaGo]

Since this topic is back alive, I should mention that I tried a higher octane in my last two tanks, with no noticeable increase in mileage and/or performance. Mind you, it was an ethanol mix, so it may have had a part to play. You won't blow up your engine with higher octane, but whatever benefits probably do not outweigh the extra cost.

[aca72]

My take:
Got a cheap car? Buy cheap gas.
Use "87 or higher" (per Yaris manual).
Maintain your car diligently and drive sensibly.

[Black Yaris]

everytime I use more premium fuel I get better fuel econimy..... the econ rating on the sticker from the factory were tested with 89 octane.... I use 89 or 91

[Kaotic Lazagna]

brought back from the dead again. lol...i have't used premium every since the last time this thread was resurrected.

[Black Yaris]

I am half temped to kill it.... I think we have all repeated our selves 3 times in this thead argueing the same thing back and forth, getting nowear... everyone is going to believe what they are going to believe... and not one is going to change there minds

[Kaotic Lazagna]

yes, please kill my thread. let someone else start a war. i did it with this thread and my synthetic oil thread.

[Black Yaris]

dead... too much bickering...